

<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.tree.com/role/AccruedExpensesAndOtherCurrentLiabilitiesDetailsBalanceSheet" xlink:href="tree-20190331.xsd#AccruedExpensesAndOtherCurrentLiabilitiesDetailsBalanceSheet" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/AccruedExpensesAndOtherCurrentLiabilitiesNote" xlink:href="tree-20190331.xsd#AccruedExpensesAndOtherCurrentLiabilitiesNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/AccruedExpensesAndOtherCurrentLiabilitiesTables" xlink:href="tree-20190331.xsd#AccruedExpensesAndOtherCurrentLiabilitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/AssetsHeldForSaleAssetsHeldForSaleScheduleForAssetsHeldForSaleDetails" xlink:href="tree-20190331.xsd#AssetsHeldForSaleAssetsHeldForSaleScheduleForAssetsHeldForSaleDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/AssetsHeldForSaleNotes" xlink:href="tree-20190331.xsd#AssetsHeldForSaleNotes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/AssetsHeldForSaleTables" xlink:href="tree-20190331.xsd#AssetsHeldForSaleTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/BusinessAcquisitionBusinessAcquisitionDetailsChangesInContingentConsideration" xlink:href="tree-20190331.xsd#BusinessAcquisitionBusinessAcquisitionDetailsChangesInContingentConsideration" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/BusinessAcquisitionBusinessAcquisitionDetailsProFormaFinancialResults" xlink:href="tree-20190331.xsd#BusinessAcquisitionBusinessAcquisitionDetailsProFormaFinancialResults" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/BusinessAcquisitionDetailsAcquisitions" xlink:href="tree-20190331.xsd#BusinessAcquisitionDetailsAcquisitions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/BusinessAcquisitionNote" xlink:href="tree-20190331.xsd#BusinessAcquisitionNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/BusinessAcquisitionTables" xlink:href="tree-20190331.xsd#BusinessAcquisitionTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/CashAndRestrictedCashDetailsBalanceSheet" xlink:href="tree-20190331.xsd#CashAndRestrictedCashDetailsBalanceSheet" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/CashAndRestrictedCashNote" xlink:href="tree-20190331.xsd#CashAndRestrictedCashNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/CashAndRestrictedCashTables" xlink:href="tree-20190331.xsd#CashAndRestrictedCashTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/ConsolidatedBalanceSheets" xlink:href="tree-20190331.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="tree-20190331.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/ConsolidatedStatementOfShareholdersEquity" xlink:href="tree-20190331.xsd#ConsolidatedStatementOfShareholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="tree-20190331.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:href="tree-20190331.xsd#ConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/ContingenciesDetails" xlink:href="tree-20190331.xsd#ContingenciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/ContingenciesNote" xlink:href="tree-20190331.xsd#ContingenciesNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/DebtDetailsConvertibleNoteHedgeAndWarrantTransactions" xlink:href="tree-20190331.xsd#DebtDetailsConvertibleNoteHedgeAndWarrantTransactions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/DebtDetailsConvertibleSeniorNotes" xlink:href="tree-20190331.xsd#DebtDetailsConvertibleSeniorNotes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/DebtDetailsRevolvingCreditFacility" xlink:href="tree-20190331.xsd#DebtDetailsRevolvingCreditFacility" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/DebtNote" xlink:href="tree-20190331.xsd#DebtNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/DebtTable" xlink:href="tree-20190331.xsd#DebtTable" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/DiscontinuedOperationsDetailsDisposalGroups" xlink:href="tree-20190331.xsd#DiscontinuedOperationsDetailsDisposalGroups" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/DiscontinuedOperationsDetailsLoanLossObligations" xlink:href="tree-20190331.xsd#DiscontinuedOperationsDetailsLoanLossObligations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/DiscontinuedOperationsNote" xlink:href="tree-20190331.xsd#DiscontinuedOperationsNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/DiscontinuedOperationsTables" xlink:href="tree-20190331.xsd#DiscontinuedOperationsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/DocumentAndEntityInformation" xlink:href="tree-20190331.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/FairValueMeasurementsDetails" xlink:href="tree-20190331.xsd#FairValueMeasurementsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/FairValueMeasurementsNote" xlink:href="tree-20190331.xsd#FairValueMeasurementsNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/FairValueMeasurementsTables" xlink:href="tree-20190331.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/GoodwillAndIntangibleAssetsDetails5YrDefiniteLivedIntangiblesAmortization" xlink:href="tree-20190331.xsd#GoodwillAndIntangibleAssetsDetails5YrDefiniteLivedIntangiblesAmortization" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/GoodwillAndIntangibleAssetsDetailsBalanceSheet" xlink:href="tree-20190331.xsd#GoodwillAndIntangibleAssetsDetailsBalanceSheet" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/GoodwillAndIntangibleAssetsDetailsDefiniteLivedIntangibles" xlink:href="tree-20190331.xsd#GoodwillAndIntangibleAssetsDetailsDefiniteLivedIntangibles" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/GoodwillAndIntangibleAssetsDetailsGoodwillAndIndefiniteLivedIntangibles" xlink:href="tree-20190331.xsd#GoodwillAndIntangibleAssetsDetailsGoodwillAndIndefiniteLivedIntangibles" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/GoodwillAndIntangibleAssetsNote" xlink:href="tree-20190331.xsd#GoodwillAndIntangibleAssetsNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/GoodwillAndIntangibleAssetsTables" xlink:href="tree-20190331.xsd#GoodwillAndIntangibleAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/IncomeTaxesDetails" xlink:href="tree-20190331.xsd#IncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/IncomeTaxesNote" xlink:href="tree-20190331.xsd#IncomeTaxesNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/IncomeTaxesTables" xlink:href="tree-20190331.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/LeasesLesseeOperatingLeasesSupplementalCashFlowInformationDetails" xlink:href="tree-20190331.xsd#LeasesLesseeOperatingLeasesSupplementalCashFlowInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/LeasesNarrativeDetails" xlink:href="tree-20190331.xsd#LeasesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/LeasesNotes" xlink:href="tree-20190331.xsd#LeasesNotes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/LeasesOperatingLeaseMaturityDetails" xlink:href="tree-20190331.xsd#LeasesOperatingLeaseMaturityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/LeasesOperatingLeaseMaturityReceivableDetails" xlink:href="tree-20190331.xsd#LeasesOperatingLeaseMaturityReceivableDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/LeasesSummaryOfLeaseExpenseAndWeightedAverageDetails" xlink:href="tree-20190331.xsd#LeasesSummaryOfLeaseExpenseAndWeightedAverageDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/LeasesTables" xlink:href="tree-20190331.xsd#LeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/OrganizationNote" xlink:href="tree-20190331.xsd#OrganizationNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/RevenueDetails" xlink:href="tree-20190331.xsd#RevenueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/RevenueNote" xlink:href="tree-20190331.xsd#RevenueNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/RevenueScheduleOfRevenueTables" xlink:href="tree-20190331.xsd#RevenueScheduleOfRevenueTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/SegmentInformationDetails" xlink:href="tree-20190331.xsd#SegmentInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/SegmentInformationNote" xlink:href="tree-20190331.xsd#SegmentInformationNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/SegmentInformationTables" xlink:href="tree-20190331.xsd#SegmentInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/ShareholdersEquityDetails" xlink:href="tree-20190331.xsd#ShareholdersEquityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/ShareholdersEquityNote" xlink:href="tree-20190331.xsd#ShareholdersEquityNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/ShareholdersEquityTables" xlink:href="tree-20190331.xsd#ShareholdersEquityTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/SignificantAccountingPoliciesDetails" xlink:href="tree-20190331.xsd#SignificantAccountingPoliciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/SignificantAccountingPoliciesNote" xlink:href="tree-20190331.xsd#SignificantAccountingPoliciesNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/SignificantAccountingPoliciesPolicies" xlink:href="tree-20190331.xsd#SignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/StockBasedCompensationDetailsPlImpact" xlink:href="tree-20190331.xsd#StockBasedCompensationDetailsPlImpact" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/StockBasedCompensationDetailsRsaRsuRollforwards" xlink:href="tree-20190331.xsd#StockBasedCompensationDetailsRsaRsuRollforwards" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/StockBasedCompensationDetailsStockOptionsRollforward" xlink:href="tree-20190331.xsd#StockBasedCompensationDetailsStockOptionsRollforward" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/StockBasedCompensationNote" xlink:href="tree-20190331.xsd#StockBasedCompensationNote" xlink:type="simple" />
  <link:roleRef roleURI="http://www.tree.com/role/StockBasedCompensationTables" xlink:href="tree-20190331.xsd#StockBasedCompensationTables" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <link:definitionLink xlink:role="http://www.tree.com/role/AccruedExpensesAndOtherCurrentLiabilitiesDetailsBalanceSheet" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/AccruedExpensesAndOtherCurrentLiabilitiesNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/AccruedExpensesAndOtherCurrentLiabilitiesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/AssetsHeldForSaleAssetsHeldForSaleScheduleForAssetsHeldForSaleDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongLivedAssetsHeldForSaleLineItems" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable" xlink:label="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_375E40FCD4D7B5D3C38F4BAF8C9E83A1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_375E40FCD4D7B5D3C38F4BAF8C9E83A1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_7319AC2B643AFACDBFF64BAF8C9FBBAE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_375E40FCD4D7B5D3C38F4BAF8C9E83A1" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_7319AC2B643AFACDBFF64BAF8C9FBBAE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9E53C0DC33C60845AEDD4BAF8C9FD157_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7319AC2B643AFACDBFF64BAF8C9FBBAE" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9E53C0DC33C60845AEDD4BAF8C9FD157_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9E53C0DC33C60845AEDD4BAF8C9FD157" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7319AC2B643AFACDBFF64BAF8C9FBBAE" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9E53C0DC33C60845AEDD4BAF8C9FD157" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_TwoOfficeBuildingsInCharlotteNCMember" xlink:label="loc_tree_TwoOfficeBuildingsInCharlotteNCMember_E4ECAFBF64FEEB98809F4BAF8C9F7F02" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9E53C0DC33C60845AEDD4BAF8C9FD157" xlink:to="loc_tree_TwoOfficeBuildingsInCharlotteNCMember_E4ECAFBF64FEEB98809F4BAF8C9F7F02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F994C8C59E7830991FF44BAF8C9FE73A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_375E40FCD4D7B5D3C38F4BAF8C9E83A1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F994C8C59E7830991FF44BAF8C9FE73A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_CD95942439E035B5E0D34BAF8CA0D660_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F994C8C59E7830991FF44BAF8C9FE73A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_CD95942439E035B5E0D34BAF8CA0D660_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_CD95942439E035B5E0D34BAF8CA0D660" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_F994C8C59E7830991FF44BAF8C9FE73A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_CD95942439E035B5E0D34BAF8CA0D660" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LeasesAcquiredInPlaceMember" xlink:label="loc_us-gaap_LeasesAcquiredInPlaceMember_9721EDAFFA84D05C010F4BAF8CA0A56D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_CD95942439E035B5E0D34BAF8CA0D660" xlink:to="loc_us-gaap_LeasesAcquiredInPlaceMember_9721EDAFFA84D05C010F4BAF8CA0A56D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_2022D4F9BC8A9321F9DC4BAF8CA0B82F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfLongLivedAssetsHeldForSaleTable_375E40FCD4D7B5D3C38F4BAF8C9E83A1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_2022D4F9BC8A9321F9DC4BAF8CA0B82F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E63D2C8853A559B73EFC4BAF8CA0F7B8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_2022D4F9BC8A9321F9DC4BAF8CA0B82F" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E63D2C8853A559B73EFC4BAF8CA0F7B8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E63D2C8853A559B73EFC4BAF8CA0F7B8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_2022D4F9BC8A9321F9DC4BAF8CA0B82F" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E63D2C8853A559B73EFC4BAF8CA0F7B8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LandMember" xlink:label="loc_us-gaap_LandMember_DBB6BC6343861CBA0ED74BAF8CA1F4BA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E63D2C8853A559B73EFC4BAF8CA0F7B8" xlink:to="loc_us-gaap_LandMember_DBB6BC6343861CBA0ED74BAF8CA1F4BA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BuildingAndBuildingImprovementsMember" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_35FEC2C85376BA43E8C84BAF8CA12A18" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E63D2C8853A559B73EFC4BAF8CA0F7B8" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_35FEC2C85376BA43E8C84BAF8CA12A18" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LandImprovementsMember" xlink:label="loc_us-gaap_LandImprovementsMember_B897F579EFE848E16B954BAF8CA1093D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E63D2C8853A559B73EFC4BAF8CA0F7B8" xlink:to="loc_us-gaap_LandImprovementsMember_B897F579EFE848E16B954BAF8CA1093D" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ComputerEquipmentandCapitalizedSoftwareMember" xlink:label="loc_tree_ComputerEquipmentandCapitalizedSoftwareMember_E83619811FDF4E9F20DA4BAF8CA17AC2" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E63D2C8853A559B73EFC4BAF8CA0F7B8" xlink:to="loc_tree_ComputerEquipmentandCapitalizedSoftwareMember_E83619811FDF4E9F20DA4BAF8CA17AC2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_A685A088A37DB0C327DA4BAF8CA15820" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_E63D2C8853A559B73EFC4BAF8CA0F7B8" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_A685A088A37DB0C327DA4BAF8CA15820" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_NumberOfOfficeBuildingsAcquired" xlink:label="loc_tree_NumberOfOfficeBuildingsAcquired_F91F3F4F3FC3B0782AB04BAF8CA268EA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_tree_NumberOfOfficeBuildingsAcquired_F91F3F4F3FC3B0782AB04BAF8CA268EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_5813C002A9833F1E9CA94BCBDE3E6A8F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_5813C002A9833F1E9CA94BCBDE3E6A8F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent" xlink:label="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent_9329A1A0D459BBC094224BAF8CA2154B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent_9329A1A0D459BBC094224BAF8CA2154B" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_AssetsHeldForSaleNotPartOfDisposalGroupPropertyPlantAndEquipmentGross" xlink:label="loc_tree_AssetsHeldForSaleNotPartOfDisposalGroupPropertyPlantAndEquipmentGross_A2B69A899EB478731DF74BAF8CA25294" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_tree_AssetsHeldForSaleNotPartOfDisposalGroupPropertyPlantAndEquipmentGross_A2B69A899EB478731DF74BAF8CA25294" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_AssetsHeldForSaleNotPartOfDisposalGroupPropertyPlantAndEquipmentAccumulatedDepreciationDepletionAndAmortization" xlink:label="loc_tree_AssetsHeldForSaleNotPartOfDisposalGroupPropertyPlantAndEquipmentAccumulatedDepreciationDepletionAndAmortization_C195611810C74D7455944BAF8CA2AF9A" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_tree_AssetsHeldForSaleNotPartOfDisposalGroupPropertyPlantAndEquipmentAccumulatedDepreciationDepletionAndAmortization_C195611810C74D7455944BAF8CA2AF9A" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_AssetsHeldForSaleNotPartOfDisposalGroupPropertyPlantAndEquipmentNet" xlink:label="loc_tree_AssetsHeldForSaleNotPartOfDisposalGroupPropertyPlantAndEquipmentNet_F324AC77848609893BD84BAF8CA39B8A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_tree_AssetsHeldForSaleNotPartOfDisposalGroupPropertyPlantAndEquipmentNet_F324AC77848609893BD84BAF8CA39B8A" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_AssetsHeldForSaleNotPartOfDisposalGroupFiniteLivedIntangibleAssetsGross" xlink:label="loc_tree_AssetsHeldForSaleNotPartOfDisposalGroupFiniteLivedIntangibleAssetsGross_BD5D79BCC2588623EC144BAF8CA35919" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_tree_AssetsHeldForSaleNotPartOfDisposalGroupFiniteLivedIntangibleAssetsGross_BD5D79BCC2588623EC144BAF8CA35919" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_9F374D64EB43B87AAB464BAF8CA3C14D" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_9F374D64EB43B87AAB464BAF8CA3C14D" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_AssetsHeldForSaleNotPartOfDisposalGroupFiniteLivedIntangibleAssetsNet" xlink:label="loc_tree_AssetsHeldForSaleNotPartOfDisposalGroupFiniteLivedIntangibleAssetsNet_1CE2D1BC9A914FA2B7AD4BAF8CA37B2C" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_tree_AssetsHeldForSaleNotPartOfDisposalGroupFiniteLivedIntangibleAssetsNet_1CE2D1BC9A914FA2B7AD4BAF8CA37B2C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_274CF129FF8289CC30A74BAF8CA3811A" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_274CF129FF8289CC30A74BAF8CA3811A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AcquisitionCosts" xlink:label="loc_us-gaap_AcquisitionCosts_802E053E96EE825118CF4BAF8CA32FC6" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_us-gaap_AcquisitionCosts_802E053E96EE825118CF4BAF8CA32FC6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="loc_us-gaap_NumberOfReportableSegments_7B1CE9488931D98CE5114BAF8CA44338" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleLineItems_FCBA7B03DB60800433484BAF8CA25D9D" xlink:to="loc_us-gaap_NumberOfReportableSegments_7B1CE9488931D98CE5114BAF8CA44338" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/AssetsHeldForSaleNotes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/AssetsHeldForSaleTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/BusinessAcquisitionBusinessAcquisitionDetailsChangesInContingentConsideration" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ACA948A62C9CA3469EC8463E89DC4FDB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ACA948A62C9CA3469EC8463E89DC4FDB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_2038EA00EBEDAD97304C463E89DD0CC0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ACA948A62C9CA3469EC8463E89DC4FDB" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_2038EA00EBEDAD97304C463E89DD0CC0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_CA2B447EAF7353C66070463E89E245F2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_2038EA00EBEDAD97304C463E89DD0CC0" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_CA2B447EAF7353C66070463E89E245F2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_CA2B447EAF7353C66070463E89E245F2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_2038EA00EBEDAD97304C463E89DD0CC0" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_CA2B447EAF7353C66070463E89E245F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_605B65B43C77CC353A90463E89E27CBF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_CA2B447EAF7353C66070463E89E245F2" xlink:to="loc_us-gaap_SubsequentEventMember_605B65B43C77CC353A90463E89E27CBF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContingentConsiderationByTypeAxis" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_0A1564AF4AF13487A511463E89E465C1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ACA948A62C9CA3469EC8463E89DC4FDB" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_0A1564AF4AF13487A511463E89E465C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContingentConsiderationTypeDomain" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_4289E30E23FFB1E17FDF463E89E4DA3E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_0A1564AF4AF13487A511463E89E465C1" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_4289E30E23FFB1E17FDF463E89E4DA3E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContingentConsiderationTypeDomain" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_4289E30E23FFB1E17FDF463E89E4DA3E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_0A1564AF4AF13487A511463E89E465C1" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_4289E30E23FFB1E17FDF463E89E4DA3E" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_EarnoutPaymentforOneContingentEarnoutMember" xlink:label="loc_tree_EarnoutPaymentforOneContingentEarnoutMember_EAAFF4A95B3D177C2A32463E89E42A02" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_4289E30E23FFB1E17FDF463E89E4DA3E" xlink:to="loc_tree_EarnoutPaymentforOneContingentEarnoutMember_EAAFF4A95B3D177C2A32463E89E42A02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_87484C6411E0D9FD8E7D463E89E578B9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ACA948A62C9CA3469EC8463E89DC4FDB" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_87484C6411E0D9FD8E7D463E89E578B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2FB2996A89C2CBAED589463E89E5604F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_87484C6411E0D9FD8E7D463E89E578B9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2FB2996A89C2CBAED589463E89E5604F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2FB2996A89C2CBAED589463E89E5604F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_87484C6411E0D9FD8E7D463E89E578B9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2FB2996A89C2CBAED589463E89E5604F" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_DepositAccountsMember" xlink:label="loc_tree_DepositAccountsMember_FDAA44933E763D5FC506463E89E5AC39" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2FB2996A89C2CBAED589463E89E5604F" xlink:to="loc_tree_DepositAccountsMember_FDAA44933E763D5FC506463E89E5AC39" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_SnapCapMember" xlink:label="loc_tree_SnapCapMember_F70AF10654552400E78E463E89E62DDB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2FB2996A89C2CBAED589463E89E5604F" xlink:to="loc_tree_SnapCapMember_F70AF10654552400E78E463E89E62DDB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_AA4FA3C47DA5067E9A40463E89E654C6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_AA4FA3C47DA5067E9A40463E89E654C6" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_BusinessCombinationNumberOfPayments" xlink:label="loc_tree_BusinessCombinationNumberOfPayments_4368714984433E54A258463E89E6195D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_tree_BusinessCombinationNumberOfPayments_4368714984433E54A258463E89E6195D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow_D3771EAA4B03C0060C36463E89E6A58B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow_D3771EAA4B03C0060C36463E89E6A58B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_F6A46E66562BF1E7B4BF463E89E66C93" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_F6A46E66562BF1E7B4BF463E89E66C93" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_DC7468DCC50AC5D49F35463E89E7F9D1" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_DC7468DCC50AC5D49F35463E89E7F9D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_3AEF057DEAC11835AEFB463E89EC5155" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_3AEF057DEAC11835AEFB463E89EC5155" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentForContingentConsiderationLiabilityInvestingActivities" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityInvestingActivities_C53D77957CF04ABB1A64463E89EC8055" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityInvestingActivities_C53D77957CF04ABB1A64463E89EC8055" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_7CE051BF9A7A0AB32186463E89ECBDB5" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_7CE051BF9A7A0AB32186463E89ECBDB5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_F306D17DBB1050EE9EB1463E89EC75EF" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_F306D17DBB1050EE9EB1463E89EC75EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_8400F186FAD20752DBCF463E89EDC0A8" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_8400F186FAD20752DBCF463E89EDC0A8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_1C597CF620151E295D97463E89EDA5EC" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_1C597CF620151E295D97463E89EDA5EC" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_BusinessCombinationContingentConsiderationIndividualPaymentsBasedonSpecifiedIncreasesinFederalFundsInterestRates" xlink:label="loc_tree_BusinessCombinationContingentConsiderationIndividualPaymentsBasedonSpecifiedIncreasesinFederalFundsInterestRates_C0F9CDBC5791DFF9EDA9463E89ED61E6" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_tree_BusinessCombinationContingentConsiderationIndividualPaymentsBasedonSpecifiedIncreasesinFederalFundsInterestRates_C0F9CDBC5791DFF9EDA9463E89ED61E6" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_BusinessCombinationContingentConsiderationOneTimePerformancePayment" xlink:label="loc_tree_BusinessCombinationContingentConsiderationOneTimePerformancePayment_125029ED1915280F4ED8463E89EE34BB" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_tree_BusinessCombinationContingentConsiderationOneTimePerformancePayment_125029ED1915280F4ED8463E89EE34BB" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_NumberOfContingentConsiderationPayments" xlink:label="loc_tree_NumberOfContingentConsiderationPayments_B4384E8942DD19A83B4A465590BE82F5" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4E8C28E34195B2BCB7E1463E89E68650" xlink:to="loc_tree_NumberOfContingentConsiderationPayments_B4384E8942DD19A83B4A465590BE82F5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/BusinessAcquisitionBusinessAcquisitionDetailsProFormaFinancialResults" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_3AE8DF8DE5809779CD5C4C004AD0799F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentsTable" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentsTable_C0A53888C9C493710BE64C004ACCC652" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_3AE8DF8DE5809779CD5C4C004AD0799F" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentsTable_C0A53888C9C493710BE64C004ACCC652" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_D23A166A65CD9C656FB04C004ACC4C63" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentsTable_C0A53888C9C493710BE64C004ACCC652" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_D23A166A65CD9C656FB04C004ACC4C63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EB3F84739476FBB2F16C4C004ACCDBD7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_D23A166A65CD9C656FB04C004ACC4C63" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EB3F84739476FBB2F16C4C004ACCDBD7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EB3F84739476FBB2F16C4C004ACCDBD7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_D23A166A65CD9C656FB04C004ACC4C63" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EB3F84739476FBB2F16C4C004ACCDBD7" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_QuoteWizardMember" xlink:label="loc_tree_QuoteWizardMember_47FF05C2FB93EE5061AE4C004ACC8104" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_EB3F84739476FBB2F16C4C004ACCDBD7" xlink:to="loc_tree_QuoteWizardMember_47FF05C2FB93EE5061AE4C004ACC8104" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_DC221E1E4BAA98257CCD4C004AD0B3C4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_3AE8DF8DE5809779CD5C4C004AD0799F" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_DC221E1E4BAA98257CCD4C004AD0B3C4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_0EEDF448E450F1A812954C004AD0CBB5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_3AE8DF8DE5809779CD5C4C004AD0799F" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_0EEDF448E450F1A812954C004AD0CBB5" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_BusinessCombinationContingentConsiderationArrangementsAfterTaxContingentConsiderationExpense" xlink:label="loc_tree_BusinessCombinationContingentConsiderationArrangementsAfterTaxContingentConsiderationExpense_7D89C34006A18355FF7D4C004AD07D3A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_3AE8DF8DE5809779CD5C4C004AD0799F" xlink:to="loc_tree_BusinessCombinationContingentConsiderationArrangementsAfterTaxContingentConsiderationExpense_7D89C34006A18355FF7D4C004AD07D3A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_BA2BF1F9E3C319DC8B114C004AD0EEE8" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_3AE8DF8DE5809779CD5C4C004AD0799F" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_BA2BF1F9E3C319DC8B114C004AD0EEE8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_AA503FF027B1AB1EFB784C004AD09A34" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_3AE8DF8DE5809779CD5C4C004AD0799F" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_AA503FF027B1AB1EFB784C004AD09A34" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_798E2BBBCA50312C45514C004AD0D009" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_3AE8DF8DE5809779CD5C4C004AD0799F" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_798E2BBBCA50312C45514C004AD0D009" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/BusinessAcquisitionDetailsAcquisitions" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_F0829C1543726231B60C5514267493C5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_F0829C1543726231B60C5514267493C5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_6912EBE33EB08ACC255E55142674F6E2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_F0829C1543726231B60C5514267493C5" xlink:to="loc_us-gaap_CreditFacilityAxis_6912EBE33EB08ACC255E55142674F6E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_F62D21471C338283373A551426748127_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_6912EBE33EB08ACC255E55142674F6E2" xlink:to="loc_us-gaap_CreditFacilityDomain_F62D21471C338283373A551426748127_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_F62D21471C338283373A551426748127" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_6912EBE33EB08ACC255E55142674F6E2" xlink:to="loc_us-gaap_CreditFacilityDomain_F62D21471C338283373A551426748127" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_EEAE9E128607A0F4410C55142674122B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_F62D21471C338283373A551426748127" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_EEAE9E128607A0F4410C55142674122B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_0F9A90F4D62496F9BDDA5514267465A1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_F0829C1543726231B60C5514267493C5" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_0F9A90F4D62496F9BDDA5514267465A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_43D7CC5A6CB5A18995BC5514267430AB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_0F9A90F4D62496F9BDDA5514267465A1" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_43D7CC5A6CB5A18995BC5514267430AB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_43D7CC5A6CB5A18995BC5514267430AB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_0F9A90F4D62496F9BDDA5514267465A1" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_43D7CC5A6CB5A18995BC5514267430AB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_7A57AACBF680A843847F55142674E4C6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_43D7CC5A6CB5A18995BC5514267430AB" xlink:to="loc_us-gaap_SubsequentEventMember_7A57AACBF680A843847F55142674E4C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContingentConsiderationByTypeAxis" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_E968D175BC7DF2A3DE8A551426742269" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_F0829C1543726231B60C5514267493C5" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_E968D175BC7DF2A3DE8A551426742269" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContingentConsiderationTypeDomain" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_B454E625229E54D53052551426748334_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_E968D175BC7DF2A3DE8A551426742269" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_B454E625229E54D53052551426748334_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContingentConsiderationTypeDomain" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_B454E625229E54D53052551426748334" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_E968D175BC7DF2A3DE8A551426742269" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_B454E625229E54D53052551426748334" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_EarnoutPaymentforOneContingentEarnoutMember" xlink:label="loc_tree_EarnoutPaymentforOneContingentEarnoutMember_E6CA9F3CCF1FF4E6BF39551426745417" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_B454E625229E54D53052551426748334" xlink:to="loc_tree_EarnoutPaymentforOneContingentEarnoutMember_E6CA9F3CCF1FF4E6BF39551426745417" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_74DA5DAFF7FFD6874151551426745AD5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_F0829C1543726231B60C5514267493C5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_74DA5DAFF7FFD6874151551426745AD5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AEFB19BDCC8FEAA4CA32551426743513_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_74DA5DAFF7FFD6874151551426745AD5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AEFB19BDCC8FEAA4CA32551426743513_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AEFB19BDCC8FEAA4CA32551426743513" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_74DA5DAFF7FFD6874151551426745AD5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AEFB19BDCC8FEAA4CA32551426743513" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TechnologyBasedIntangibleAssetsMember" xlink:label="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_5504819EA02EF23F60F855142674E1C3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AEFB19BDCC8FEAA4CA32551426743513" xlink:to="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_5504819EA02EF23F60F855142674E1C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CustomerListsMember" xlink:label="loc_us-gaap_CustomerListsMember_07533C694DDD6CD9D08D55142683102A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AEFB19BDCC8FEAA4CA32551426743513" xlink:to="loc_us-gaap_CustomerListsMember_07533C694DDD6CD9D08D55142683102A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MediaContentMember" xlink:label="loc_us-gaap_MediaContentMember_A4E3E1169599EFC6CF4155142683136A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AEFB19BDCC8FEAA4CA32551426743513" xlink:to="loc_us-gaap_MediaContentMember_A4E3E1169599EFC6CF4155142683136A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TrademarksAndTradeNamesMember" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_A87DAD2A9F152875DEB75514268370AF" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AEFB19BDCC8FEAA4CA32551426743513" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_A87DAD2A9F152875DEB75514268370AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_C1F679F7143BC226415855142683205F" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_F0829C1543726231B60C5514267493C5" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_C1F679F7143BC226415855142683205F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4EFD30DF1401DA43B70355142683554A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_C1F679F7143BC226415855142683205F" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4EFD30DF1401DA43B70355142683554A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4EFD30DF1401DA43B70355142683554A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_C1F679F7143BC226415855142683205F" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4EFD30DF1401DA43B70355142683554A" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ValuePenguinMember" xlink:label="loc_tree_ValuePenguinMember_A4BA39A026B182EE0BB255142683ED5D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4EFD30DF1401DA43B70355142683554A" xlink:to="loc_tree_ValuePenguinMember_A4BA39A026B182EE0BB255142683ED5D" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_QuoteWizardMember" xlink:label="loc_tree_QuoteWizardMember_7069DB13894A76809A91551426835D7C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4EFD30DF1401DA43B70355142683554A" xlink:to="loc_tree_QuoteWizardMember_7069DB13894A76809A91551426835D7C" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_OvationMember" xlink:label="loc_tree_OvationMember_0FD233B1F6900B15629755142683A527" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4EFD30DF1401DA43B70355142683554A" xlink:to="loc_tree_OvationMember_0FD233B1F6900B15629755142683A527" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_EarnoutPaymentforOneContingentEarnoutMember" xlink:label="loc_tree_EarnoutPaymentforOneContingentEarnoutMember_D47856CE15A76D4A069255142683AD46" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4EFD30DF1401DA43B70355142683554A" xlink:to="loc_tree_EarnoutPaymentforOneContingentEarnoutMember_D47856CE15A76D4A069255142683AD46" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_DepositAccountsMember" xlink:label="loc_tree_DepositAccountsMember_0A2929BB1CB4EBEB4B3B5514268338DF" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4EFD30DF1401DA43B70355142683554A" xlink:to="loc_tree_DepositAccountsMember_0A2929BB1CB4EBEB4B3B5514268338DF" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_SnapCapMember" xlink:label="loc_tree_SnapCapMember_D2701221557454EE806F5514268369E4" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4EFD30DF1401DA43B70355142683554A" xlink:to="loc_tree_SnapCapMember_D2701221557454EE806F5514268369E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredAbstract" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_DFDEEDE2938B6B4953DA551426839472" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_DFDEEDE2938B6B4953DA551426839472" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedWorkingCapital" xlink:label="loc_tree_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedWorkingCapital_608C99D0C99928E2FA475514268396B9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_DFDEEDE2938B6B4953DA551426839472" xlink:to="loc_tree_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedWorkingCapital_608C99D0C99928E2FA475514268396B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_F954978167A24AB9F2E155142683B3D7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_DFDEEDE2938B6B4953DA551426839472" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_F954978167A24AB9F2E155142683B3D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_064DEB8045C954EEC64D5514268305EE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_DFDEEDE2938B6B4953DA551426839472" xlink:to="loc_us-gaap_Goodwill_064DEB8045C954EEC64D5514268305EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent_706C252FEC127E46EA7755142683BBCB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_DFDEEDE2938B6B4953DA551426839472" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent_706C252FEC127E46EA7755142683BBCB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_BAA0CCE3EB1E45881D8955142683E19C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_DFDEEDE2938B6B4953DA551426839472" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_BAA0CCE3EB1E45881D8955142683E19C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_35DBB339134DD3F8E25055142683EF21" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_DFDEEDE2938B6B4953DA551426839472" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_35DBB339134DD3F8E25055142683EF21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_A1AC8A30E3D51EE6BCCB55142683A714" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_A1AC8A30E3D51EE6BCCB55142683A714" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_D02A023FFF8F57256754551426832244" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_A1AC8A30E3D51EE6BCCB55142683A714" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_D02A023FFF8F57256754551426832244" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_78C0BFB9367736175E3D551426833963" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_A1AC8A30E3D51EE6BCCB55142683A714" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_78C0BFB9367736175E3D551426833963" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_6E71987CAC2C4D452991551426836DAB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_6E71987CAC2C4D452991551426836DAB" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_BusinessCombinationConsiderationTransferredCashOnHand" xlink:label="loc_tree_BusinessCombinationConsiderationTransferredCashOnHand_700332A9E591A49BAC6B55142683822D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_tree_BusinessCombinationConsiderationTransferredCashOnHand_700332A9E591A49BAC6B55142683822D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_7B0EB327FBC9D9CCD70C55142683E372" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_7B0EB327FBC9D9CCD70C55142683E372" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_86A996DD47EE0B3F4FAC55142683B239" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_86A996DD47EE0B3F4FAC55142683B239" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_FA2584F73AFD50FA9CB655142683675D" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_FA2584F73AFD50FA9CB655142683675D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_1E4320A855EC984716D65514268315AD" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_1E4320A855EC984716D65514268315AD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SeveranceCosts1" xlink:label="loc_us-gaap_SeveranceCosts1_749B03B383DF2B3DC52F551426839FAE" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_SeveranceCosts1_749B03B383DF2B3DC52F551426839FAE" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentWorkingCapital" xlink:label="loc_tree_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentWorkingCapital_8521BAA718DAE2E3FC645514268396DD" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_tree_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentWorkingCapital_8521BAA718DAE2E3FC645514268396DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="loc_us-gaap_NumberOfReportableSegments_DB24390D2E78DEB0B1B55514268342E1" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_NumberOfReportableSegments_DB24390D2E78DEB0B1B55514268342E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_DE6F23D588AD154FE955551426835937" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_DE6F23D588AD154FE955551426835937" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_BusinessCombinationNumberOfPayments" xlink:label="loc_tree_BusinessCombinationNumberOfPayments_0EDF9617CE21AFC80FDB5514268325AA" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_tree_BusinessCombinationNumberOfPayments_0EDF9617CE21AFC80FDB5514268325AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow_7CDD2E69B68FC643CC2D55142683B58F" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow_7CDD2E69B68FC643CC2D55142683B58F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_C062A07F74FDA50C63E955142683726A" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_C062A07F74FDA50C63E955142683726A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_A551A4B9F5C7ECABF15455142683BD44" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_A551A4B9F5C7ECABF15455142683BD44" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_053D7B2D7D3B8A0BE19255142683CC94" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_4F65FA60E52996C0E0B1551426832D94" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_053D7B2D7D3B8A0BE19255142683CC94" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/BusinessAcquisitionNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/BusinessAcquisitionTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/CashAndRestrictedCashDetailsBalanceSheet" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/CashAndRestrictedCashNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/CashAndRestrictedCashTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_323AF12A28ACCF86598851A510D46A71" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_99332E1BA697165993DF51A510D485CF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_323AF12A28ACCF86598851A510D46A71" xlink:to="loc_us-gaap_StatementTable_99332E1BA697165993DF51A510D485CF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_D27B8BD9596E3B90853651A510D48CFB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_99332E1BA697165993DF51A510D485CF" xlink:to="loc_us-gaap_StatementScenarioAxis_D27B8BD9596E3B90853651A510D48CFB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_3AF1AFE9CC679658FF5B51A510D4CC15_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_D27B8BD9596E3B90853651A510D48CFB" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_3AF1AFE9CC679658FF5B51A510D4CC15_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_3AF1AFE9CC679658FF5B51A510D4CC15" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_D27B8BD9596E3B90853651A510D48CFB" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_3AF1AFE9CC679658FF5B51A510D4CC15" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_8D5DB985F87D1B181CDF51A510D49170" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_99332E1BA697165993DF51A510D485CF" xlink:to="loc_us-gaap_StatementClassOfStockAxis_8D5DB985F87D1B181CDF51A510D49170" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_43C9B09818187ADB8E7751A510D43D9B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_8D5DB985F87D1B181CDF51A510D49170" xlink:to="loc_us-gaap_ClassOfStockDomain_43C9B09818187ADB8E7751A510D43D9B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_43C9B09818187ADB8E7751A510D43D9B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_8D5DB985F87D1B181CDF51A510D49170" xlink:to="loc_us-gaap_ClassOfStockDomain_43C9B09818187ADB8E7751A510D43D9B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/ConsolidatedStatementOfShareholdersEquity" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_643A5511EC6DBD48347851A51086EE88" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_697B39E4DD1BA5A5302451A510762F48" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_643A5511EC6DBD48347851A51086EE88" xlink:to="loc_us-gaap_StatementTable_697B39E4DD1BA5A5302451A510762F48" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_4CD2E3B8D87EA38E1AB651A510760285" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_697B39E4DD1BA5A5302451A510762F48" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_4CD2E3B8D87EA38E1AB651A510760285" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_B15038C780E799CBA78551A51076D0B5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_4CD2E3B8D87EA38E1AB651A510760285" xlink:to="loc_us-gaap_EquityComponentDomain_B15038C780E799CBA78551A51076D0B5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_B15038C780E799CBA78551A51076D0B5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_4CD2E3B8D87EA38E1AB651A510760285" xlink:to="loc_us-gaap_EquityComponentDomain_B15038C780E799CBA78551A51076D0B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_AA3E57B0C1B8C33D2C6C51A5107666FB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_B15038C780E799CBA78551A51076D0B5" xlink:to="loc_us-gaap_CommonStockMember_AA3E57B0C1B8C33D2C6C51A5107666FB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_7C8977A0A1FF44111A3E51A510765C03" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_B15038C780E799CBA78551A51076D0B5" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_7C8977A0A1FF44111A3E51A510765C03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_BA3418F984ECEC8E81D651A510763826" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_B15038C780E799CBA78551A51076D0B5" xlink:to="loc_us-gaap_RetainedEarningsMember_BA3418F984ECEC8E81D651A510763826" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_AA04315DC8DDE5A2AF0151A510768864" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_B15038C780E799CBA78551A51076D0B5" xlink:to="loc_us-gaap_TreasuryStockMember_AA04315DC8DDE5A2AF0151A510768864" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomeMember" xlink:label="loc_us-gaap_ComprehensiveIncomeMember_1D514E43A952B2AC647D51A51076803C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_B15038C780E799CBA78551A51076D0B5" xlink:to="loc_us-gaap_ComprehensiveIncomeMember_1D514E43A952B2AC647D51A51076803C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_D57C22088AE9E22F602A51A51086477E" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_B15038C780E799CBA78551A51076D0B5" xlink:to="loc_us-gaap_NoncontrollingInterestMember_D57C22088AE9E22F602A51A51086477E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2E21C86828EE81A2EC3751A51086902D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_643A5511EC6DBD48347851A51086EE88" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2E21C86828EE81A2EC3751A51086902D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_9689D605788D401C63BE51A510867501" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2E21C86828EE81A2EC3751A51086902D" xlink:to="loc_us-gaap_StockholdersEquity_9689D605788D401C63BE51A510867501" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharesIssued" xlink:label="loc_us-gaap_SharesIssued_B8B46A9D0610A7B2AF1251A51086CD00" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2E21C86828EE81A2EC3751A51086902D" xlink:to="loc_us-gaap_SharesIssued_B8B46A9D0610A7B2AF1251A51086CD00" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_4D4CCBC36E25002235EE51A5108698F9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2E21C86828EE81A2EC3751A51086902D" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_4D4CCBC36E25002235EE51A5108698F9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_E86F503B3447F326D8E451A51086B080" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2E21C86828EE81A2EC3751A51086902D" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_E86F503B3447F326D8E451A51086B080" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_571F6F642C44E2AFFE7F51A51086A7CE" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2E21C86828EE81A2EC3751A51086902D" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_571F6F642C44E2AFFE7F51A51086A7CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_6251B4F37F28CD30755951A510861B90" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2E21C86828EE81A2EC3751A51086902D" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_6251B4F37F28CD30755951A510861B90" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_9D8A0B738F7EC3B19CF551A510862279" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2E21C86828EE81A2EC3751A51086902D" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_9D8A0B738F7EC3B19CF551A510862279" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_5741F7446385E9BC895151A510860D24" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2E21C86828EE81A2EC3751A51086902D" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_5741F7446385E9BC895151A510860D24" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification" xlink:label="loc_us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification_B221AF41974F93F1305051A510869B10" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2E21C86828EE81A2EC3751A51086902D" xlink:to="loc_us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification_B221AF41974F93F1305051A510869B10" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_191B5D791C516A0934DB51A5108645A5" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2E21C86828EE81A2EC3751A51086902D" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_191B5D791C516A0934DB51A5108645A5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_2A3DD73CC1C45644A25D59EA5EB19B2F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_FB62A2D85C5F61E756B359EA5EAF2FC6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_2A3DD73CC1C45644A25D59EA5EB19B2F" xlink:to="loc_us-gaap_StatementTable_FB62A2D85C5F61E756B359EA5EAF2FC6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_AA78E041B79DAA4B116259EA5EAFBD88" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_FB62A2D85C5F61E756B359EA5EAF2FC6" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_AA78E041B79DAA4B116259EA5EAFBD88" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_61FA7D1EC8581548EF3159EA5EB04C1C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_AA78E041B79DAA4B116259EA5EAFBD88" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_61FA7D1EC8581548EF3159EA5EB04C1C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_61FA7D1EC8581548EF3159EA5EB04C1C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_AA78E041B79DAA4B116259EA5EAFBD88" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_61FA7D1EC8581548EF3159EA5EB04C1C" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ValuePenguinMember" xlink:label="loc_tree_ValuePenguinMember_7EF5262516920FA7BDCA59EA5EB095D1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_61FA7D1EC8581548EF3159EA5EB04C1C" xlink:to="loc_tree_ValuePenguinMember_7EF5262516920FA7BDCA59EA5EB095D1" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_OvationMember" xlink:label="loc_tree_OvationMember_4200A467B323C88A049659EA5EB0F7B6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_61FA7D1EC8581548EF3159EA5EB04C1C" xlink:to="loc_tree_OvationMember_4200A467B323C88A049659EA5EB0F7B6" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_SnapCapMember" xlink:label="loc_tree_SnapCapMember_ACD9EC3CE9B1E39372E759EA5EB08C2B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_61FA7D1EC8581548EF3159EA5EB04C1C" xlink:to="loc_tree_SnapCapMember_ACD9EC3CE9B1E39372E759EA5EB08C2B" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_DepositAccountsMember" xlink:label="loc_tree_DepositAccountsMember_3872C71F4FAE0BE4995059EA5EB1874F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_61FA7D1EC8581548EF3159EA5EB04C1C" xlink:to="loc_tree_DepositAccountsMember_3872C71F4FAE0BE4995059EA5EB1874F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_22A3A075753F30EFC4DD59EA5EB14BD1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2A3DD73CC1C45644A25D59EA5EB19B2F" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_22A3A075753F30EFC4DD59EA5EB14BD1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_7EEA9D7F283908AEF21959EA5EB138D8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_22A3A075753F30EFC4DD59EA5EB14BD1" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_7EEA9D7F283908AEF21959EA5EB138D8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_EEA31DA86CEB39ADA22059EA5EB27489" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_22A3A075753F30EFC4DD59EA5EB14BD1" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_EEA31DA86CEB39ADA22059EA5EB27489" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperations" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_D11EC7695197A24BC47B59EA5EB7735C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_22A3A075753F30EFC4DD59EA5EB14BD1" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_D11EC7695197A24BC47B59EA5EB7735C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4906BF57022C20A489659EA5EB73EB3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_22A3A075753F30EFC4DD59EA5EB14BD1" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4906BF57022C20A489659EA5EB73EB3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_A641B84DBA679C9BB78959EA5EB823D3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4906BF57022C20A489659EA5EB73EB3" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_A641B84DBA679C9BB78959EA5EB823D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_FBA4217BE8E8F0881EA459EA5EB83330" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4906BF57022C20A489659EA5EB73EB3" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_FBA4217BE8E8F0881EA459EA5EB83330" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_AB8E1B0275275BA4BEB059EA5EB87ACC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4906BF57022C20A489659EA5EB73EB3" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_AB8E1B0275275BA4BEB059EA5EB87ACC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherDepreciationAndAmortization" xlink:label="loc_us-gaap_OtherDepreciationAndAmortization_C708640DC37D89DF5D4F59EA5EB8CF41" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4906BF57022C20A489659EA5EB73EB3" xlink:to="loc_us-gaap_OtherDepreciationAndAmortization_C708640DC37D89DF5D4F59EA5EB8CF41" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_4B4E1AD704C31324A97159EA5EB9D085" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4906BF57022C20A489659EA5EB73EB3" xlink:to="loc_us-gaap_ShareBasedCompensation_4B4E1AD704C31324A97159EA5EB9D085" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_DeferredIncomeTaxNoncashExpenseBenefit" xlink:label="loc_tree_DeferredIncomeTaxNoncashExpenseBenefit_7DB94B6B761A4E11D0B059EA5EB97B19" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4906BF57022C20A489659EA5EB73EB3" xlink:to="loc_tree_DeferredIncomeTaxNoncashExpenseBenefit_7DB94B6B761A4E11D0B059EA5EB97B19" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_B9AEB36EE84A6E8B66CB59EA5EB952DD" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4906BF57022C20A489659EA5EB73EB3" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_B9AEB36EE84A6E8B66CB59EA5EB952DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_E2446A1E36B52F6C14A059EA5EB92536" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4906BF57022C20A489659EA5EB73EB3" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_E2446A1E36B52F6C14A059EA5EB92536" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_60C9E83A8BA7F3D449F559EA5EB912D9" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4906BF57022C20A489659EA5EB73EB3" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_60C9E83A8BA7F3D449F559EA5EB912D9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfDebtDiscountPremium" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_EF31A92FDB5EF4185B3259EA5EBAAAB0" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_B4906BF57022C20A489659EA5EB73EB3" xlink:to="loc_us-gaap_AmortizationOfDebtDiscountPremium_EF31A92FDB5EF4185B3259EA5EBAAAB0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AB5B8729065F1B477BD459EA5EBA9BDB" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_22A3A075753F30EFC4DD59EA5EB14BD1" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AB5B8729065F1B477BD459EA5EBA9BDB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_268280E2F81B7D813DD959EA5EBAFA03" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AB5B8729065F1B477BD459EA5EBA9BDB" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_268280E2F81B7D813DD959EA5EBAFA03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_1FCBED24D1CE668F291E59EA5EBA01A3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AB5B8729065F1B477BD459EA5EBA9BDB" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_1FCBED24D1CE668F291E59EA5EBA01A3" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_IncreaseDecreaseInAccountsPayableAndOtherCurrentLiabilities" xlink:label="loc_tree_IncreaseDecreaseInAccountsPayableAndOtherCurrentLiabilities_11B828925D7F87236C4059EA5EBAA630" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AB5B8729065F1B477BD459EA5EBA9BDB" xlink:to="loc_tree_IncreaseDecreaseInAccountsPayableAndOtherCurrentLiabilities_11B828925D7F87236C4059EA5EBAA630" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ContingentConsiderationPayment" xlink:label="loc_tree_ContingentConsiderationPayment_12CBF4AB3D3802CC745059EA5EBB44B4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AB5B8729065F1B477BD459EA5EBA9BDB" xlink:to="loc_tree_ContingentConsiderationPayment_12CBF4AB3D3802CC745059EA5EBB44B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_150977F10558097E5D6759EA5EBBF36A" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AB5B8729065F1B477BD459EA5EBA9BDB" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_150977F10558097E5D6759EA5EBBF36A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_056E6E5A115EFEFC519459EA5EBB63A1" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AB5B8729065F1B477BD459EA5EBA9BDB" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_056E6E5A115EFEFC519459EA5EBB63A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_D30E08EC1574DA602EDB59EA5EBBB319" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_22A3A075753F30EFC4DD59EA5EB14BD1" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_D30E08EC1574DA602EDB59EA5EBBB319" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_EE38DCD2D1730456B79959EA5EBBBEDF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2A3DD73CC1C45644A25D59EA5EB19B2F" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_EE38DCD2D1730456B79959EA5EBBBEDF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_7486428D7BEA2C307CB059EA5EBCC138" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_EE38DCD2D1730456B79959EA5EBBBEDF" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_7486428D7BEA2C307CB059EA5EBCC138" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_9E749224481ABCC2AD8159EA5EBC6EAA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_EE38DCD2D1730456B79959EA5EBBBEDF" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_9E749224481ABCC2AD8159EA5EBC6EAA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_E081851BB34EB7F5ED5559EA5EBCC3E0" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_EE38DCD2D1730456B79959EA5EBBBEDF" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_E081851BB34EB7F5ED5559EA5EBCC3E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_E6A5267316887DA5DCF659EA5EBC5165" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_EE38DCD2D1730456B79959EA5EBBBEDF" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_E6A5267316887DA5DCF659EA5EBC5165" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_BD0271E5A88FA1458E1359EA5EBC3CB8" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_EE38DCD2D1730456B79959EA5EBBBEDF" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_BD0271E5A88FA1458E1359EA5EBC3CB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_7694DAF6B82356B78DC259EA5EBC2FF2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2A3DD73CC1C45644A25D59EA5EB19B2F" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_7694DAF6B82356B78DC259EA5EBC2FF2" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ProceedsPaymentsRelatedToNetShareSettlementOfStockBasedCompensationNet" xlink:label="loc_tree_ProceedsPaymentsRelatedToNetShareSettlementOfStockBasedCompensationNet_A16802B0F71A172FF44259EA5EBCF748" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_7694DAF6B82356B78DC259EA5EBC2FF2" xlink:to="loc_tree_ProceedsPaymentsRelatedToNetShareSettlementOfStockBasedCompensationNet_A16802B0F71A172FF44259EA5EBCF748" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_5B1F8BA258693F9DFCC759EA5EBDB6F2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_7694DAF6B82356B78DC259EA5EBC2FF2" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_5B1F8BA258693F9DFCC759EA5EBDB6F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_2EE24F483E8E494F5ED859EA5EBD7A5E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_7694DAF6B82356B78DC259EA5EBC2FF2" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_2EE24F483E8E494F5ED859EA5EBD7A5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_9E30F5F97FD766E9FC6959EA5EBD1298" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_7694DAF6B82356B78DC259EA5EBC2FF2" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_9E30F5F97FD766E9FC6959EA5EBD1298" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_0FCBBE80B1820E29090A59EA5EBDDD35" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_7694DAF6B82356B78DC259EA5EBC2FF2" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_0FCBBE80B1820E29090A59EA5EBDDD35" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_401509CAE29DEB79397959EA5EBD7BCF" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_7694DAF6B82356B78DC259EA5EBC2FF2" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_401509CAE29DEB79397959EA5EBD7BCF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInContinuingOperations_E316BD943E3541ACD30E59EA5EBE6211" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2A3DD73CC1C45644A25D59EA5EB19B2F" xlink:to="loc_us-gaap_NetCashProvidedByUsedInContinuingOperations_E316BD943E3541ACD30E59EA5EBE6211" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_C5422E2991B27911FDD159EA5EBEB05B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2A3DD73CC1C45644A25D59EA5EB19B2F" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_C5422E2991B27911FDD159EA5EBEB05B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInDiscontinuedOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperations_2CBD3142010FD1A8D39359EA5EBED31A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2A3DD73CC1C45644A25D59EA5EB19B2F" xlink:to="loc_us-gaap_NetCashProvidedByUsedInDiscontinuedOperations_2CBD3142010FD1A8D39359EA5EBED31A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_5793AF1FE5CB4872C76059EA5EBE0804" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2A3DD73CC1C45644A25D59EA5EB19B2F" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_5793AF1FE5CB4872C76059EA5EBE0804" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D08C5A5896A948B675E359EA5EBEA62C" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2A3DD73CC1C45644A25D59EA5EB19B2F" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D08C5A5896A948B675E359EA5EBEA62C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NoncashInvestingAndFinancingItemsAbstract" xlink:label="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_29EBBC085FF86D133A1959EA5EBFA4E7" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2A3DD73CC1C45644A25D59EA5EB19B2F" xlink:to="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_29EBBC085FF86D133A1959EA5EBFA4E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CapitalLeaseObligationsIncurred" xlink:label="loc_us-gaap_CapitalLeaseObligationsIncurred_DD9B25662D18DB2ECBAF59EA5EBFDC06" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_29EBBC085FF86D133A1959EA5EBFA4E7" xlink:to="loc_us-gaap_CapitalLeaseObligationsIncurred_DD9B25662D18DB2ECBAF59EA5EBFDC06" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_D9D0FBC32D89F32EA9BC51A4E76F2044" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_StatementTable_D9D0FBC32D89F32EA9BC51A4E76F2044" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_A26F453EDCBD0D2CF4C351A4E76F0AD4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_D9D0FBC32D89F32EA9BC51A4E76F2044" xlink:to="loc_us-gaap_StatementScenarioAxis_A26F453EDCBD0D2CF4C351A4E76F0AD4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_71515AC9860A7221EB0851A4E7704031_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_A26F453EDCBD0D2CF4C351A4E76F0AD4" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_71515AC9860A7221EB0851A4E7704031_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_71515AC9860A7221EB0851A4E7704031" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_A26F453EDCBD0D2CF4C351A4E76F0AD4" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_71515AC9860A7221EB0851A4E7704031" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_76DA2F9FC7D411DB55A751A4E770B49E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_Revenues_76DA2F9FC7D411DB55A751A4E770B49E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_1B0A5625D0D1D62EC27951A4E77153EF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_1B0A5625D0D1D62EC27951A4E77153EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_DF22F0C490A849D6A79D51A4E771DEAD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_1B0A5625D0D1D62EC27951A4E77153EF" xlink:to="loc_us-gaap_CostOfRevenue_DF22F0C490A849D6A79D51A4E771DEAD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SellingAndMarketingExpense" xlink:label="loc_us-gaap_SellingAndMarketingExpense_7DA31BE98EF7E228EC3051A4E771D6A5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_1B0A5625D0D1D62EC27951A4E77153EF" xlink:to="loc_us-gaap_SellingAndMarketingExpense_7DA31BE98EF7E228EC3051A4E771D6A5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_27A11D96A3472E51BBF451A4E77125A8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_1B0A5625D0D1D62EC27951A4E77153EF" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_27A11D96A3472E51BBF451A4E77125A8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_530BDE0C78C601C003B451A4E772B5DA" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_1B0A5625D0D1D62EC27951A4E77153EF" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_530BDE0C78C601C003B451A4E772B5DA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_B541967A4F9F7904444651A4E77296A4" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_1B0A5625D0D1D62EC27951A4E77153EF" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_B541967A4F9F7904444651A4E77296A4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_A0B6E9C3824F1E16367951A4E7727F85" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_1B0A5625D0D1D62EC27951A4E77153EF" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_A0B6E9C3824F1E16367951A4E7727F85" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_1817A9AFC6F22332DDE251A4E7723078" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_1B0A5625D0D1D62EC27951A4E77153EF" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_1817A9AFC6F22332DDE251A4E7723078" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SeveranceCosts1" xlink:label="loc_us-gaap_SeveranceCosts1_C6251E095428F16350FF51A4E773620E" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_1B0A5625D0D1D62EC27951A4E77153EF" xlink:to="loc_us-gaap_SeveranceCosts1_C6251E095428F16350FF51A4E773620E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationSettlementExpense" xlink:label="loc_us-gaap_LitigationSettlementExpense_D02271C371118ABC9FAC51A4E7736A5C" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_1B0A5625D0D1D62EC27951A4E77153EF" xlink:to="loc_us-gaap_LitigationSettlementExpense_D02271C371118ABC9FAC51A4E7736A5C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_102814C9A7F328ABC92651A4E773C135" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_1B0A5625D0D1D62EC27951A4E77153EF" xlink:to="loc_us-gaap_CostsAndExpenses_102814C9A7F328ABC92651A4E773C135" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_69024FB32E8CA4675AE751A4E7742A6C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_OperatingIncomeLoss_69024FB32E8CA4675AE751A4E7742A6C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpenseAbstract" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_859C3223BFD6B6038E8151A4E7749A87" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_859C3223BFD6B6038E8151A4E7749A87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestIncomeExpenseNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_66C4920DA26D912ED98351A4E775A6B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_859C3223BFD6B6038E8151A4E7749A87" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_66C4920DA26D912ED98351A4E775A6B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_7CCB9769D863CC27698851A4E7759C1E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_859C3223BFD6B6038E8151A4E7749A87" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_7CCB9769D863CC27698851A4E7759C1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_89971B625FAAFDA8356C51A4E7759509" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_89971B625FAAFDA8356C51A4E7759509" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_CEC68E091BAC2710AC7F51A4E775B528" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_CEC68E091BAC2710AC7F51A4E775B528" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperations" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_FE9AC4C5B43B001CA39151A4E7766EED" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_FE9AC4C5B43B001CA39151A4E7766EED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_BC85E1BDCE82EE540BEB51A4E77628A8" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_BC85E1BDCE82EE540BEB51A4E77628A8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_6346B5192A245A76203351A4E776D545" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_6346B5192A245A76203351A4E776D545" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_BD809519A58BB930EDCF51A4E77668C3" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_BD809519A58BB930EDCF51A4E77668C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_EFA5A223EA1FCF991E4D51A4E7772556" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_BD809519A58BB930EDCF51A4E77668C3" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_EFA5A223EA1FCF991E4D51A4E7772556" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2171ED6E4F7528A4843A51A4E777A743" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_BD809519A58BB930EDCF51A4E77668C3" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2171ED6E4F7528A4843A51A4E777A743" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDilutedAbstract_0A849600ABD12C450DD751A4E777AC38" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_EarningsPerShareBasicAndDilutedAbstract_0A849600ABD12C450DD751A4E777AC38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_EC5939F0DACF76518D0151A4E77730C7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAndDilutedAbstract_0A849600ABD12C450DD751A4E777AC38" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_EC5939F0DACF76518D0151A4E77730C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_6926899034D5F50770AA51A4E7789922" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAndDilutedAbstract_0A849600ABD12C450DD751A4E777AC38" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_6926899034D5F50770AA51A4E7789922" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsAndDisposalOfDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShareAbstract" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsAndDisposalOfDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShareAbstract_47C0D3BCF6B58D02A20551A4E778D5FB" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsAndDisposalOfDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShareAbstract_47C0D3BCF6B58D02A20551A4E778D5FB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_DFEB84A9C038D4EFF8A551A4E778993B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsAndDisposalOfDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShareAbstract_47C0D3BCF6B58D02A20551A4E778D5FB" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_DFEB84A9C038D4EFF8A551A4E778993B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_C9C75B7489BBBE8C956B51A4E7786D0F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsAndDisposalOfDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShareAbstract_47C0D3BCF6B58D02A20551A4E778D5FB" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_C9C75B7489BBBE8C956B51A4E7786D0F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_2BCEA8AA0F718B30F92A51A4E778AFB7" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_08C2E9C0D589DE49D29051A4E770739F" xlink:to="loc_us-gaap_EarningsPerShareAbstract_2BCEA8AA0F718B30F92A51A4E778AFB7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_1E3A3A6D0A22C5C23C1551A4E7793EDA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_2BCEA8AA0F718B30F92A51A4E778AFB7" xlink:to="loc_us-gaap_EarningsPerShareBasic_1E3A3A6D0A22C5C23C1551A4E7793EDA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_C5CFB4A02694FB02B36251A4E7799356" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_2BCEA8AA0F718B30F92A51A4E778AFB7" xlink:to="loc_us-gaap_EarningsPerShareDiluted_C5CFB4A02694FB02B36251A4E7799356" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/ContingenciesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_C96F1F5157C8A9CBA4E05A3166AADFCB" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_3DA7BC27447C770924CC5A3166AA9142" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_C96F1F5157C8A9CBA4E05A3166AADFCB" xlink:to="loc_us-gaap_LossContingenciesTable_3DA7BC27447C770924CC5A3166AA9142" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_DDF88DCDCCBADFA421F45A3166AAB81E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_3DA7BC27447C770924CC5A3166AA9142" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_DDF88DCDCCBADFA421F45A3166AAB81E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_903A7DA9C603DBB44CB25A3166AA5583_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_DDF88DCDCCBADFA421F45A3166AAB81E" xlink:to="loc_us-gaap_LossContingencyNatureDomain_903A7DA9C603DBB44CB25A3166AA5583_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_903A7DA9C603DBB44CB25A3166AA5583" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_DDF88DCDCCBADFA421F45A3166AAB81E" xlink:to="loc_us-gaap_LossContingencyNatureDomain_903A7DA9C603DBB44CB25A3166AA5583" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_AttorneyFeesMember" xlink:label="loc_tree_AttorneyFeesMember_5B81C82C64731EB994345A3166AA70C1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_903A7DA9C603DBB44CB25A3166AA5583" xlink:to="loc_tree_AttorneyFeesMember_5B81C82C64731EB994345A3166AA70C1" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_PreVerdictInterestMember" xlink:label="loc_tree_PreVerdictInterestMember_44CFFFBF30BE344BEE8B5A3166AAD64C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_903A7DA9C603DBB44CB25A3166AA5583" xlink:to="loc_tree_PreVerdictInterestMember_44CFFFBF30BE344BEE8B5A3166AAD64C" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_PreJudgmentInterestMember" xlink:label="loc_tree_PreJudgmentInterestMember_0B453E8A1FF60D6E6C385A3166AA8BF9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_903A7DA9C603DBB44CB25A3166AA5583" xlink:to="loc_tree_PreJudgmentInterestMember_0B453E8A1FF60D6E6C385A3166AA8BF9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_005803487EFE852C92FD5A3166AA0B61" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_3DA7BC27447C770924CC5A3166AA9142" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_005803487EFE852C92FD5A3166AA0B61" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_9BF477C1023541E4E4695A3166AA442B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_005803487EFE852C92FD5A3166AA0B61" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_9BF477C1023541E4E4695A3166AA442B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_9BF477C1023541E4E4695A3166AA442B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_005803487EFE852C92FD5A3166AA0B61" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_9BF477C1023541E4E4695A3166AA442B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationsDisposedOfBySaleMember" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_B77AC2D536DA856B5AD35A3166AA8F4B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_9BF477C1023541E4E4695A3166AA442B" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_B77AC2D536DA856B5AD35A3166AA8F4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_CE935D9D8217C261DB995A3166AA492B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_3DA7BC27447C770924CC5A3166AA9142" xlink:to="loc_us-gaap_RangeAxis_CE935D9D8217C261DB995A3166AA492B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_F5D735D757B557F965255A3166AA6A50_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_CE935D9D8217C261DB995A3166AA492B" xlink:to="loc_us-gaap_RangeMember_F5D735D757B557F965255A3166AA6A50_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_F5D735D757B557F965255A3166AA6A50" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_CE935D9D8217C261DB995A3166AA492B" xlink:to="loc_us-gaap_RangeMember_F5D735D757B557F965255A3166AA6A50" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_3CC32CBE8AA16FF28AF85A3166AAB945" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_F5D735D757B557F965255A3166AA6A50" xlink:to="loc_us-gaap_MinimumMember_3CC32CBE8AA16FF28AF85A3166AAB945" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_9B7DED8D6C39EAE8E4C25A3166AADBCB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_F5D735D757B557F965255A3166AA6A50" xlink:to="loc_us-gaap_MaximumMember_9B7DED8D6C39EAE8E4C25A3166AADBCB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationStatusAxis" xlink:label="loc_us-gaap_LitigationStatusAxis_EE87949AE984696F1ED55A3166AA80FC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_3DA7BC27447C770924CC5A3166AA9142" xlink:to="loc_us-gaap_LitigationStatusAxis_EE87949AE984696F1ED55A3166AA80FC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationStatusDomain" xlink:label="loc_us-gaap_LitigationStatusDomain_A8A9AE069D00C512CE435A3166AAC1CC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationStatusAxis_EE87949AE984696F1ED55A3166AA80FC" xlink:to="loc_us-gaap_LitigationStatusDomain_A8A9AE069D00C512CE435A3166AAC1CC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationStatusDomain" xlink:label="loc_us-gaap_LitigationStatusDomain_A8A9AE069D00C512CE435A3166AAC1CC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationStatusAxis_EE87949AE984696F1ED55A3166AA80FC" xlink:to="loc_us-gaap_LitigationStatusDomain_A8A9AE069D00C512CE435A3166AAC1CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PendingLitigationMember" xlink:label="loc_us-gaap_PendingLitigationMember_C222315285991CF47DB05A3166AAEEF0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_A8A9AE069D00C512CE435A3166AAC1CC" xlink:to="loc_us-gaap_PendingLitigationMember_C222315285991CF47DB05A3166AAEEF0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_JudicialRulingMember" xlink:label="loc_us-gaap_JudicialRulingMember_479BA24FF758AD5C40185A3166AA0064" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_A8A9AE069D00C512CE435A3166AAC1CC" xlink:to="loc_us-gaap_JudicialRulingMember_479BA24FF758AD5C40185A3166AA0064" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SettledLitigationMember" xlink:label="loc_us-gaap_SettledLitigationMember_E580883DD8BD3B56DDAE5A3166AA64D3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_A8A9AE069D00C512CE435A3166AAC1CC" xlink:to="loc_us-gaap_SettledLitigationMember_E580883DD8BD3B56DDAE5A3166AA64D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationCaseAxis" xlink:label="loc_us-gaap_LitigationCaseAxis_42D917CE01AD6A53255B5A3166AAA23F" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_3DA7BC27447C770924CC5A3166AA9142" xlink:to="loc_us-gaap_LitigationCaseAxis_42D917CE01AD6A53255B5A3166AAA23F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationCaseTypeDomain" xlink:label="loc_us-gaap_LitigationCaseTypeDomain_731FD67E70AFD580B7625A3166AA1359_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationCaseAxis_42D917CE01AD6A53255B5A3166AAA23F" xlink:to="loc_us-gaap_LitigationCaseTypeDomain_731FD67E70AFD580B7625A3166AA1359_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationCaseTypeDomain" xlink:label="loc_us-gaap_LitigationCaseTypeDomain_731FD67E70AFD580B7625A3166AA1359" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationCaseAxis_42D917CE01AD6A53255B5A3166AAA23F" xlink:to="loc_us-gaap_LitigationCaseTypeDomain_731FD67E70AFD580B7625A3166AA1359" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ResidentialFundingCompanyDomain" xlink:label="loc_tree_ResidentialFundingCompanyDomain_FCDA7629F7A338E059CE5A3166AAB657" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationCaseTypeDomain_731FD67E70AFD580B7625A3166AA1359" xlink:to="loc_tree_ResidentialFundingCompanyDomain_FCDA7629F7A338E059CE5A3166AAB657" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ResidentialFundingCo.vHomeLoanCenterMember" xlink:label="loc_tree_ResidentialFundingCo.vHomeLoanCenterMember_BA76DB32B54C3740BD8D5A3166AA6C90" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationCaseTypeDomain_731FD67E70AFD580B7625A3166AA1359" xlink:to="loc_tree_ResidentialFundingCo.vHomeLoanCenterMember_BA76DB32B54C3740BD8D5A3166AA6C90" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LehmanBrothersHoldingsInc.DemandLetterMember" xlink:label="loc_tree_LehmanBrothersHoldingsInc.DemandLetterMember_12CF58D3411D3A6891C65A3166AA777A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationCaseTypeDomain_731FD67E70AFD580B7625A3166AA1359" xlink:to="loc_tree_LehmanBrothersHoldingsInc.DemandLetterMember_12CF58D3411D3A6891C65A3166AA777A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationReserve" xlink:label="loc_us-gaap_LitigationReserve_06746DC10B1E1C679CDD5A3166AA85DD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_C96F1F5157C8A9CBA4E05A3166AADFCB" xlink:to="loc_us-gaap_LitigationReserve_06746DC10B1E1C679CDD5A3166AA85DD" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingencyNumberOfLoanOriginators" xlink:label="loc_tree_LossContingencyNumberOfLoanOriginators_ED404C457E0097084FF95A3166AAF5A1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_C96F1F5157C8A9CBA4E05A3166AADFCB" xlink:to="loc_tree_LossContingencyNumberOfLoanOriginators_ED404C457E0097084FF95A3166AAF5A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyPendingClaimsNumber" xlink:label="loc_us-gaap_LossContingencyPendingClaimsNumber_C621543F77D98CAF48945A3166AAA9BE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_C96F1F5157C8A9CBA4E05A3166AADFCB" xlink:to="loc_us-gaap_LossContingencyPendingClaimsNumber_C621543F77D98CAF48945A3166AAA9BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyDamagesSought" xlink:label="loc_us-gaap_LossContingencyDamagesSought_C28A422458BDE5C4F1085A3166AAE7A5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_C96F1F5157C8A9CBA4E05A3166AADFCB" xlink:to="loc_us-gaap_LossContingencyDamagesSought_C28A422458BDE5C4F1085A3166AAE7A5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationSettlementAmountAwardedToOtherParty" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_05674F341D7D8984D9F55A3166AA7CE3" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_C96F1F5157C8A9CBA4E05A3166AADFCB" xlink:to="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_05674F341D7D8984D9F55A3166AA7CE3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyDamagesSoughtValue" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_A252337F88DEC32C005A5A3166AAB883" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_C96F1F5157C8A9CBA4E05A3166AADFCB" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_A252337F88DEC32C005A5A3166AAB883" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationSettlementInterest" xlink:label="loc_us-gaap_LitigationSettlementInterest_AF11EFE81349D5D1F32E5A3166AA4476" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_C96F1F5157C8A9CBA4E05A3166AADFCB" xlink:to="loc_us-gaap_LitigationSettlementInterest_AF11EFE81349D5D1F32E5A3166AA4476" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_C9E02AEE5CBEEF7DB96F5A3166AAFE09" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_C96F1F5157C8A9CBA4E05A3166AADFCB" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_C9E02AEE5CBEEF7DB96F5A3166AAFE09" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyNumberOfDefendants" xlink:label="loc_us-gaap_LossContingencyNumberOfDefendants_8DC02CEB5F6400F093555A3166AAC58C" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_C96F1F5157C8A9CBA4E05A3166AADFCB" xlink:to="loc_us-gaap_LossContingencyNumberOfDefendants_8DC02CEB5F6400F093555A3166AAC58C" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingenciesNumberOfLoansSoldWithLosses" xlink:label="loc_tree_LossContingenciesNumberOfLoansSoldWithLosses_FB4CF7CAACD5F7CBC04A5A3166AA2411" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_C96F1F5157C8A9CBA4E05A3166AADFCB" xlink:to="loc_tree_LossContingenciesNumberOfLoansSoldWithLosses_FB4CF7CAACD5F7CBC04A5A3166AA2411" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/ContingenciesNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/DebtDetailsConvertibleNoteHedgeAndWarrantTransactions" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_6BC4ED62D8185FCDA703CEDD0EB6755B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_1C896357D1F652599DEB3082B514A934" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_6BC4ED62D8185FCDA703CEDD0EB6755B" xlink:to="loc_us-gaap_DebtInstrumentTable_1C896357D1F652599DEB3082B514A934" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_2CB9EE36F5F15CF5AD6F35A6C4D3BA89" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1C896357D1F652599DEB3082B514A934" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_2CB9EE36F5F15CF5AD6F35A6C4D3BA89" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5FE658CC67B78DD5A6C4FD6D5E6509A2_7177EAC867CA58E583262E1861275F5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2CB9EE36F5F15CF5AD6F35A6C4D3BA89" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5FE658CC67B78DD5A6C4FD6D5E6509A2_7177EAC867CA58E583262E1861275F5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_E99EAA01C41E55D4AE73A5BA4B81D001" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2CB9EE36F5F15CF5AD6F35A6C4D3BA89" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_E99EAA01C41E55D4AE73A5BA4B81D001" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_39E03CA0D75A5085AE341590A3997BBF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1C896357D1F652599DEB3082B514A934" xlink:to="loc_us-gaap_DebtInstrumentAxis_39E03CA0D75A5085AE341590A3997BBF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7D173C1892082407E647FD6D5E6663B4_7177EAC867CA58E583262E1861275F5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_39E03CA0D75A5085AE341590A3997BBF" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7D173C1892082407E647FD6D5E6663B4_7177EAC867CA58E583262E1861275F5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_18451C26FB4450478CAB7DB55C3B16A1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_39E03CA0D75A5085AE341590A3997BBF" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_18451C26FB4450478CAB7DB55C3B16A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_2767D76EC4C756A6B17625DAC1AE753B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1C896357D1F652599DEB3082B514A934" xlink:to="loc_us-gaap_VariableRateAxis_2767D76EC4C756A6B17625DAC1AE753B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_9ECDDAD36C746B502EF3FD6D5E6688A1_7177EAC867CA58E583262E1861275F5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_2767D76EC4C756A6B17625DAC1AE753B" xlink:to="loc_us-gaap_VariableRateDomain_9ECDDAD36C746B502EF3FD6D5E6688A1_7177EAC867CA58E583262E1861275F5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_148E718E10BD593A92B2F9916C9F4C73" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_2767D76EC4C756A6B17625DAC1AE753B" xlink:to="loc_us-gaap_VariableRateDomain_148E718E10BD593A92B2F9916C9F4C73" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_11A46AA338A65CA79C0D151CB2AA49B2" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1C896357D1F652599DEB3082B514A934" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_11A46AA338A65CA79C0D151CB2AA49B2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_50650F4D8A8A6C1A4282FD6D5E6655BF_7177EAC867CA58E583262E1861275F5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_11A46AA338A65CA79C0D151CB2AA49B2" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_50650F4D8A8A6C1A4282FD6D5E6655BF_7177EAC867CA58E583262E1861275F5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_0970AAC1011F53BC99D61615FFCD3F73" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_11A46AA338A65CA79C0D151CB2AA49B2" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_0970AAC1011F53BC99D61615FFCD3F73" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_C29B8317D2C454F78559C4509289DCA5" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1C896357D1F652599DEB3082B514A934" xlink:to="loc_us-gaap_RangeAxis_C29B8317D2C454F78559C4509289DCA5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_49BAAF1DAE9AA11859D5FD6D5E667C12_7177EAC867CA58E583262E1861275F5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_C29B8317D2C454F78559C4509289DCA5" xlink:to="loc_us-gaap_RangeMember_49BAAF1DAE9AA11859D5FD6D5E667C12_7177EAC867CA58E583262E1861275F5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_F6B5C7ED2A8D59868B102D8CA577695F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_C29B8317D2C454F78559C4509289DCA5" xlink:to="loc_us-gaap_RangeMember_F6B5C7ED2A8D59868B102D8CA577695F" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_NetproceedsfromtheConvertibleNotesusedtopayforthecostoftheConvertibleNoteHedge" xlink:label="loc_tree_NetproceedsfromtheConvertibleNotesusedtopayforthecostoftheConvertibleNoteHedge_E62F730AC69A5803911ACE54F1E6179E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_6BC4ED62D8185FCDA703CEDD0EB6755B" xlink:to="loc_tree_NetproceedsfromtheConvertibleNotesusedtopayforthecostoftheConvertibleNoteHedge_E62F730AC69A5803911ACE54F1E6179E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForHedgeFinancingActivities" xlink:label="loc_us-gaap_PaymentsForHedgeFinancingActivities_9E9222994F755540BE19FF0A6742C9E1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_6BC4ED62D8185FCDA703CEDD0EB6755B" xlink:to="loc_us-gaap_PaymentsForHedgeFinancingActivities_9E9222994F755540BE19FF0A6742C9E1" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_NumberofSharesCoveredbytheHedgeTransactions" xlink:label="loc_tree_NumberofSharesCoveredbytheHedgeTransactions_862C6C2E3E4F51D7B88D37CF87A2D8A3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_6BC4ED62D8185FCDA703CEDD0EB6755B" xlink:to="loc_tree_NumberofSharesCoveredbytheHedgeTransactions_862C6C2E3E4F51D7B88D37CF87A2D8A3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_1FED277555C551EC958946F4CCBCB2D2" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_6BC4ED62D8185FCDA703CEDD0EB6755B" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_1FED277555C551EC958946F4CCBCB2D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_511AE182202A57569051B6D4D5BE0188" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_6BC4ED62D8185FCDA703CEDD0EB6755B" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_511AE182202A57569051B6D4D5BE0188" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_Premiumofwarrantstrikepriceoversalespriceofcommonstock" xlink:label="loc_tree_Premiumofwarrantstrikepriceoversalespriceofcommonstock_9F5F6C7CCDA853A0AA2DE1CEA2F9EFA8" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_6BC4ED62D8185FCDA703CEDD0EB6755B" xlink:to="loc_tree_Premiumofwarrantstrikepriceoversalespriceofcommonstock_9F5F6C7CCDA853A0AA2DE1CEA2F9EFA8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharePrice" xlink:label="loc_us-gaap_SharePrice_9BEDE7443E355A03857329EAC0553357" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_6BC4ED62D8185FCDA703CEDD0EB6755B" xlink:to="loc_us-gaap_SharePrice_9BEDE7443E355A03857329EAC0553357" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromIssuanceOfWarrants" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfWarrants_55674321C8865842A39297072B726CD8" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_6BC4ED62D8185FCDA703CEDD0EB6755B" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfWarrants_55674321C8865842A39297072B726CD8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/DebtDetailsConvertibleSeniorNotes" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_31BD107F9604544485B560C9534866AD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_DebtInstrumentTable_31BD107F9604544485B560C9534866AD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_E18FDF79BE725C2BB46800599BFD1DF2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_31BD107F9604544485B560C9534866AD" xlink:to="loc_us-gaap_DebtInstrumentAxis_E18FDF79BE725C2BB46800599BFD1DF2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_52BF0C1C0B40FC0AC158C187AB566CDF_26EE75F018575ABDBB03DDF7AA052ABD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_E18FDF79BE725C2BB46800599BFD1DF2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_52BF0C1C0B40FC0AC158C187AB566CDF_26EE75F018575ABDBB03DDF7AA052ABD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_618C2EC2ADF95FCCA888239BC8B7821C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_E18FDF79BE725C2BB46800599BFD1DF2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_618C2EC2ADF95FCCA888239BC8B7821C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConvertibleNotesPayableMember" xlink:label="loc_us-gaap_ConvertibleNotesPayableMember_9AC96E562465569396570F564BFADF51" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_618C2EC2ADF95FCCA888239BC8B7821C" xlink:to="loc_us-gaap_ConvertibleNotesPayableMember_9AC96E562465569396570F564BFADF51" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConvertibleDebt" xlink:label="loc_us-gaap_ConvertibleDebt_352DAC95981F5B47A0EFDA619BC0BAA8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_ConvertibleDebt_352DAC95981F5B47A0EFDA619BC0BAA8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_80958AFB3C455EA6A903ECC7B4637B70" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_80958AFB3C455EA6A903ECC7B4637B70" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_DebtConversionNumberofSharesofCommonStockConvertibleper1000ofPrincipalNotes" xlink:label="loc_tree_DebtConversionNumberofSharesofCommonStockConvertibleper1000ofPrincipalNotes_5A09666A57ED5D9CA19ABBBFA77B2233" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_tree_DebtConversionNumberofSharesofCommonStockConvertibleper1000ofPrincipalNotes_5A09666A57ED5D9CA19ABBBFA77B2233" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConvertiblePreferredStockTermsOfConversion" xlink:label="loc_us-gaap_ConvertiblePreferredStockTermsOfConversion_5FFCD62D8B365A0B8D17047761D5A072" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_ConvertiblePreferredStockTermsOfConversion_5FFCD62D8B365A0B8D17047761D5A072" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_C6A42CBAA23E5F9BA1A632CC2CE3011C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_C6A42CBAA23E5F9BA1A632CC2CE3011C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_66C3CDF5781D53FEB6F5831535E1FB75" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_66C3CDF5781D53FEB6F5831535E1FB75" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdTradingDays" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_D8D100DF0DC75F8AB0A2F14FD6280537" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_D8D100DF0DC75F8AB0A2F14FD6280537" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_D2387620A4485A01828659DFE7D82F67" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_D2387620A4485A01828659DFE7D82F67" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTriggerFiveBusinessDays" xlink:label="loc_tree_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTriggerFiveBusinessDays_34BB84BD017D50CDA222D1A2854C9141" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_tree_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTriggerFiveBusinessDays_34BB84BD017D50CDA222D1A2854C9141" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_00218643F736517CA8B6F71BE1767F24" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_00218643F736517CA8B6F71BE1767F24" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_NonconvertibleDebtBorrowingRateattheDateofIssuance" xlink:label="loc_tree_NonconvertibleDebtBorrowingRateattheDateofIssuance_0EC00BBB96C95A389F0F8A8BD37F712C" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_tree_NonconvertibleDebtBorrowingRateattheDateofIssuance_0EC00BBB96C95A389F0F8A8BD37F712C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConvertibleDebtNoncurrent" xlink:label="loc_us-gaap_ConvertibleDebtNoncurrent_122D13FE27805BBC97CC6C4A7387A026" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_ConvertibleDebtNoncurrent_122D13FE27805BBC97CC6C4A7387A026" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent" xlink:label="loc_us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent_5D37D9563BCD5A46900E9CD38943630F" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent_5D37D9563BCD5A46900E9CD38943630F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredFinanceCostsGross" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_02FEB57F6221596CBB38230C7F13CAF9" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_02FEB57F6221596CBB38230C7F13CAF9" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_Debtissuancecostsliabilitycomponent" xlink:label="loc_tree_Debtissuancecostsliabilitycomponent_F508148089DD5321BE9EE687F9EC61EB" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_tree_Debtissuancecostsliabilitycomponent_F508148089DD5321BE9EE687F9EC61EB" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_Debtissuancecostsequitycomponent" xlink:label="loc_tree_Debtissuancecostsequitycomponent_CEFC028FAAB05667A048092987B71DDB" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_tree_Debtissuancecostsequitycomponent_CEFC028FAAB05667A048092987B71DDB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpenseDebt" xlink:label="loc_us-gaap_InterestExpenseDebt_4B253223E8E2502EAEC67FF4837D3967" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_InterestExpenseDebt_4B253223E8E2502EAEC67FF4837D3967" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpenseDebtExcludingAmortization" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_341031B73D365B31B972E8A2210FE245" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_341031B73D365B31B972E8A2210FE245" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfDebtDiscountPremium" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_EDCF738CEF94501D86DC82EA3CD0BEBE" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_AmortizationOfDebtDiscountPremium_EDCF738CEF94501D86DC82EA3CD0BEBE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_22D363477BAF5DD492A6B9FDD6F4D204" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_22D363477BAF5DD492A6B9FDD6F4D204" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_A3384E7C4D32515A82153BF089E55272" xlink:type="locator" />
    <link:definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_A3384E7C4D32515A82153BF089E55272" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtFairValue" xlink:label="loc_us-gaap_LongTermDebtFairValue_5B97545CD41657AAAC4961DE6839E510" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_LongTermDebtFairValue_5B97545CD41657AAAC4961DE6839E510" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_CA7AAA793BB95508AAB2AA124C2AB949" xlink:type="locator" />
    <link:definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BE58E6A38E1A56EEAE0D536445EF4245" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_CA7AAA793BB95508AAB2AA124C2AB949" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/DebtDetailsRevolvingCreditFacility" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityTable" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_B7FCFC1AF084A6CEBD464C0049BC4378" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_B7FCFC1AF084A6CEBD464C0049BC4378" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_0F697BD8AA1B44CB63F94C0049BC9C13" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_B7FCFC1AF084A6CEBD464C0049BC4378" xlink:to="loc_us-gaap_DebtInstrumentAxis_0F697BD8AA1B44CB63F94C0049BC9C13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4E7FD7736DB13F28B33F4C0049BC9E49_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_0F697BD8AA1B44CB63F94C0049BC9C13" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4E7FD7736DB13F28B33F4C0049BC9E49_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4E7FD7736DB13F28B33F4C0049BC9E49" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_0F697BD8AA1B44CB63F94C0049BC9C13" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4E7FD7736DB13F28B33F4C0049BC9E49" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_RevolvingCreditFacilityBorrowingsAtBaseRatePlusLIBORMember" xlink:label="loc_tree_RevolvingCreditFacilityBorrowingsAtBaseRatePlusLIBORMember_46A6FFE9059E5E4FA45B4C0049BCA499" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4E7FD7736DB13F28B33F4C0049BC9E49" xlink:to="loc_tree_RevolvingCreditFacilityBorrowingsAtBaseRatePlusLIBORMember_46A6FFE9059E5E4FA45B4C0049BCA499" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_BEAE784F2EF3107D66CD4C0049C04055" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4E7FD7736DB13F28B33F4C0049BC9E49" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_BEAE784F2EF3107D66CD4C0049C04055" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_RevolvingCreditFacility31DayBorrowingMember" xlink:label="loc_tree_RevolvingCreditFacility31DayBorrowingMember_DD8C9079DE8AA6B7FE1B4C27A07A1D12" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4E7FD7736DB13F28B33F4C0049BC9E49" xlink:to="loc_tree_RevolvingCreditFacility31DayBorrowingMember_DD8C9079DE8AA6B7FE1B4C27A07A1D12" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_RevolvingCreditFacility32DayBorrowingMember" xlink:label="loc_tree_RevolvingCreditFacility32DayBorrowingMember_44B78A689BD9974D722B4C28104DA6BB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_4E7FD7736DB13F28B33F4C0049BC9E49" xlink:to="loc_tree_RevolvingCreditFacility32DayBorrowingMember_44B78A689BD9974D722B4C28104DA6BB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_3CCF8DF8D825C3B474F04C0049C00F43" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_B7FCFC1AF084A6CEBD464C0049BC4378" xlink:to="loc_us-gaap_RangeAxis_3CCF8DF8D825C3B474F04C0049C00F43" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_4B15D78ED2CBAB96B5FC4C0049C0C310_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_3CCF8DF8D825C3B474F04C0049C00F43" xlink:to="loc_us-gaap_RangeMember_4B15D78ED2CBAB96B5FC4C0049C0C310_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_4B15D78ED2CBAB96B5FC4C0049C0C310" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_3CCF8DF8D825C3B474F04C0049C00F43" xlink:to="loc_us-gaap_RangeMember_4B15D78ED2CBAB96B5FC4C0049C0C310" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_EF933B6479F7C22E2D5F4C0049C0BAFC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_4B15D78ED2CBAB96B5FC4C0049C0C310" xlink:to="loc_us-gaap_MinimumMember_EF933B6479F7C22E2D5F4C0049C0BAFC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_A7CC9E7C3E555A94C4464C0049C00989" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_4B15D78ED2CBAB96B5FC4C0049C0C310" xlink:to="loc_us-gaap_MaximumMember_A7CC9E7C3E555A94C4464C0049C00989" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_D68BCCB88C12F81333504C0049C027F2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_B7FCFC1AF084A6CEBD464C0049BC4378" xlink:to="loc_us-gaap_VariableRateAxis_D68BCCB88C12F81333504C0049C027F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_0A69F5AEADC44815B6C84C0049C08367_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_D68BCCB88C12F81333504C0049C027F2" xlink:to="loc_us-gaap_VariableRateDomain_0A69F5AEADC44815B6C84C0049C08367_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_0A69F5AEADC44815B6C84C0049C08367" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_D68BCCB88C12F81333504C0049C027F2" xlink:to="loc_us-gaap_VariableRateDomain_0A69F5AEADC44815B6C84C0049C08367" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FederalFundsEffectiveSwapRateMember" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_75DDBD03E168B76F75374C0049C0245D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_0A69F5AEADC44815B6C84C0049C08367" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_75DDBD03E168B76F75374C0049C0245D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_A4A0B8FAC001610C165D4C0049C0FCD3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_0A69F5AEADC44815B6C84C0049C08367" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_A4A0B8FAC001610C165D4C0049C0FCD3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BaseRateMember" xlink:label="loc_us-gaap_BaseRateMember_BA4F14280D71DED3C6054C0049C08A73" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_0A69F5AEADC44815B6C84C0049C08367" xlink:to="loc_us-gaap_BaseRateMember_BA4F14280D71DED3C6054C0049C08A73" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_A7D0610C0A2A802333354C0049C0E3AF" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_B7FCFC1AF084A6CEBD464C0049BC4378" xlink:to="loc_us-gaap_CreditFacilityAxis_A7D0610C0A2A802333354C0049C0E3AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_9A7CA5EAE53A895692C54C0049C09D34_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_A7D0610C0A2A802333354C0049C0E3AF" xlink:to="loc_us-gaap_CreditFacilityDomain_9A7CA5EAE53A895692C54C0049C09D34_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_9A7CA5EAE53A895692C54C0049C09D34" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_A7D0610C0A2A802333354C0049C0E3AF" xlink:to="loc_us-gaap_CreditFacilityDomain_9A7CA5EAE53A895692C54C0049C09D34" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_9C04BA2BE71346C91AFC4C0049C42D9E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_9A7CA5EAE53A895692C54C0049C09D34" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_9C04BA2BE71346C91AFC4C0049C42D9E" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_SwinglineFacilityMember" xlink:label="loc_tree_SwinglineFacilityMember_1C51403F7C90A80A4FF94C0049C4542E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_9A7CA5EAE53A895692C54C0049C09D34" xlink:to="loc_tree_SwinglineFacilityMember_1C51403F7C90A80A4FF94C0049C4542E" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LettersofCreditMember" xlink:label="loc_tree_LettersofCreditMember_4ACB7284140B84A261454C0049C4EE23" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_9A7CA5EAE53A895692C54C0049C09D34" xlink:to="loc_tree_LettersofCreditMember_4ACB7284140B84A261454C0049C4EE23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_B833C6F7A3D2F06136B94C0049C45D70" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_B833C6F7A3D2F06136B94C0049C45D70" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_D5308BC0B02BFF47F3E14C0049C43F7D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_us-gaap_LongTermDebtCurrent_D5308BC0B02BFF47F3E14C0049C43F7D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtWeightedAverageInterestRate" xlink:label="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_51C8844D053FF041F6294C0049C422FD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_51C8844D053FF041F6294C0049C422FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentTerm" xlink:label="loc_us-gaap_DebtInstrumentTerm_FFA508D3D134906F4B0A4C0049C4FAEA" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_us-gaap_DebtInstrumentTerm_FFA508D3D134906F4B0A4C0049C4FAEA" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LineofCreditFacilityConditionalIncreasetoBorrowingCapacity" xlink:label="loc_tree_LineofCreditFacilityConditionalIncreasetoBorrowingCapacity_0566855CDB54246675C84C0049C4EDD8" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_LineofCreditFacilityConditionalIncreasetoBorrowingCapacity_0566855CDB54246675C84C0049C4EDD8" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_RatioofDebttoEBITDAtoIncreaseRevolvingCommitment" xlink:label="loc_tree_RatioofDebttoEBITDAtoIncreaseRevolvingCommitment_C87FA4495F41F6C61F1B4C0049C48E68" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_RatioofDebttoEBITDAtoIncreaseRevolvingCommitment_C87FA4495F41F6C61F1B4C0049C48E68" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LineOfCreditFacilityIncreaseLimit" xlink:label="loc_tree_LineOfCreditFacilityIncreaseLimit_56C06B81CC7F46C8D5B14C0049C4AD69" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_LineOfCreditFacilityIncreaseLimit_56C06B81CC7F46C8D5B14C0049C4AD69" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_87333B656F1FF15469384C0049C418C7" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_87333B656F1FF15469384C0049C418C7" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LineofCreditFacilityCollateralPercentofAssets" xlink:label="loc_tree_LineofCreditFacilityCollateralPercentofAssets_8015AEA7CAC20DE3A3F54C0049C8D108" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_LineofCreditFacilityCollateralPercentofAssets_8015AEA7CAC20DE3A3F54C0049C8D108" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LineofCreditFacilityCollateralPercentofEquity" xlink:label="loc_tree_LineofCreditFacilityCollateralPercentofEquity_BBB40406F6D6AE6BA4A34C0049C83501" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_LineofCreditFacilityCollateralPercentofEquity_BBB40406F6D6AE6BA4A34C0049C83501" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_7E2E3A2C89F906AE2AE94C0049C853CE" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_7E2E3A2C89F906AE2AE94C0049C853CE" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LineofCreditFacilityLetterofCreditParticipationFeePercentage" xlink:label="loc_tree_LineofCreditFacilityLetterofCreditParticipationFeePercentage_062414081BABD1CEAB024C0049C896DF" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_LineofCreditFacilityLetterofCreditParticipationFeePercentage_062414081BABD1CEAB024C0049C896DF" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LineofCreditFacilityLetterofCreditFrontingFeePercentage" xlink:label="loc_tree_LineofCreditFacilityLetterofCreditFrontingFeePercentage_5FA54EC23BD65EBA08664C0049C83A14" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_LineofCreditFacilityLetterofCreditFrontingFeePercentage_5FA54EC23BD65EBA08664C0049C83A14" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentFeeAmount" xlink:label="loc_us-gaap_DebtInstrumentFeeAmount_6BBB705E494AEF2048D14C0049C88B51" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_us-gaap_DebtInstrumentFeeAmount_6BBB705E494AEF2048D14C0049C88B51" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_RatioofDebttoEBITDA" xlink:label="loc_tree_RatioofDebttoEBITDA_C86120EFABD4711E1FE44C0049C85710" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_RatioofDebttoEBITDA_C86120EFABD4711E1FE44C0049C85710" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_RatioofDebttoEBITDAStepDown" xlink:label="loc_tree_RatioofDebttoEBITDAStepDown_DAB27EBB42EC0B8DCF134C0049C8E370" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_RatioofDebttoEBITDAStepDown_DAB27EBB42EC0B8DCF134C0049C8E370" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_RatioofDebttoEBITDAIncrease" xlink:label="loc_tree_RatioofDebttoEBITDAIncrease_75EC8FF087ADD960F9724C0049C8C89D" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_RatioofDebttoEBITDAIncrease_75EC8FF087ADD960F9724C0049C8C89D" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LineofCreditFacilityCollateralPercentofDomesticSubsidiariesEquity" xlink:label="loc_tree_LineofCreditFacilityCollateralPercentofDomesticSubsidiariesEquity_EDB1D02E59C994D3B0164C0049CCC8B4" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_LineofCreditFacilityCollateralPercentofDomesticSubsidiariesEquity_EDB1D02E59C994D3B0164C0049CCC8B4" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LineofCreditFacilityCollateralPercentofVotingEquity" xlink:label="loc_tree_LineofCreditFacilityCollateralPercentofVotingEquity_F841AB9EA3CCBC57278C4C0049CC7747" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_LineofCreditFacilityCollateralPercentofVotingEquity_F841AB9EA3CCBC57278C4C0049CC7747" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LineofCreditFacilityCollateralPercentofNonVotingEquity" xlink:label="loc_tree_LineofCreditFacilityCollateralPercentofNonVotingEquity_B8FB90E29B874A7026004C0049CCF51C" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_tree_LineofCreditFacilityCollateralPercentofNonVotingEquity_B8FB90E29B874A7026004C0049CCF51C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpenseDebt" xlink:label="loc_us-gaap_InterestExpenseDebt_93C1718BE3CC95401F4A4C0049CC4015" xlink:type="locator" />
    <link:definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_us-gaap_InterestExpenseDebt_93C1718BE3CC95401F4A4C0049CC4015" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityFee" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityFee_B0AAA57F624133F7FC9C4C0049CC4C9F" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityFee_B0AAA57F624133F7FC9C4C0049CC4C9F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_D232C2AF4B2D2D8BE5224C0049D04E5C" xlink:type="locator" />
    <link:definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_27793FEF74DB17B546934C0049C47905" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_D232C2AF4B2D2D8BE5224C0049D04E5C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/DebtNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/DebtTable" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/DiscontinuedOperationsDetailsDisposalGroups" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_6B955876A26E51A9A5C79B2871D5CCA9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_FB9468CB5E0A5CBF926EB82838BC5FE2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_6B955876A26E51A9A5C79B2871D5CCA9" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_FB9468CB5E0A5CBF926EB82838BC5FE2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_89BB34317F705AA0B91F1F021E6EF22F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_FB9468CB5E0A5CBF926EB82838BC5FE2" xlink:to="loc_us-gaap_StatementScenarioAxis_89BB34317F705AA0B91F1F021E6EF22F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_728D779F2DE530B6FA6939408E4A16A1_67685F02F54659429BF8DB0037A103CB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_89BB34317F705AA0B91F1F021E6EF22F" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_728D779F2DE530B6FA6939408E4A16A1_67685F02F54659429BF8DB0037A103CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_5252B39811D65FEA88BE3DD838AE6268" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_89BB34317F705AA0B91F1F021E6EF22F" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_5252B39811D65FEA88BE3DD838AE6268" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_3D4DECF310365AFAA5912FB10D5787DE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_FB9468CB5E0A5CBF926EB82838BC5FE2" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_3D4DECF310365AFAA5912FB10D5787DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_110B042831D08FDA58D439408E4AC75A_67685F02F54659429BF8DB0037A103CB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_3D4DECF310365AFAA5912FB10D5787DE" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_110B042831D08FDA58D439408E4AC75A_67685F02F54659429BF8DB0037A103CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_23DBA535F202572BA140DE4377E48ED0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_3D4DECF310365AFAA5912FB10D5787DE" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_23DBA535F202572BA140DE4377E48ED0" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LendingTreeLoansMember" xlink:label="loc_tree_LendingTreeLoansMember_43D7F90514BA5585859E9041CE965363" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_23DBA535F202572BA140DE4377E48ED0" xlink:to="loc_tree_LendingTreeLoansMember_43D7F90514BA5585859E9041CE965363" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CounterpartyNameAxis" xlink:label="loc_us-gaap_CounterpartyNameAxis_973A8C7079945DEF8966BCF7CF149273" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_FB9468CB5E0A5CBF926EB82838BC5FE2" xlink:to="loc_us-gaap_CounterpartyNameAxis_973A8C7079945DEF8966BCF7CF149273" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_2EDFBD00C70529CBB4D139408E4B5013_67685F02F54659429BF8DB0037A103CB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CounterpartyNameAxis_973A8C7079945DEF8966BCF7CF149273" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_2EDFBD00C70529CBB4D139408E4B5013_67685F02F54659429BF8DB0037A103CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_D78AE6EB618651AFA3B62883A2DA46AE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CounterpartyNameAxis_973A8C7079945DEF8966BCF7CF149273" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_D78AE6EB618651AFA3B62883A2DA46AE" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_DiscoverBankMember" xlink:label="loc_tree_DiscoverBankMember_295499D03ABD5F04A111C658C93A0C1B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_D78AE6EB618651AFA3B62883A2DA46AE" xlink:to="loc_tree_DiscoverBankMember_295499D03ABD5F04A111C658C93A0C1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_E7172B4BD40B5FA6AE7C3EFC7E30980B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_6B955876A26E51A9A5C79B2871D5CCA9" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_E7172B4BD40B5FA6AE7C3EFC7E30980B" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_AssetPurchaseAgreementProceedsFromSale" xlink:label="loc_tree_AssetPurchaseAgreementProceedsFromSale_A30BD51EE5185BBAA88C0B7BA8624F1A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_6B955876A26E51A9A5C79B2871D5CCA9" xlink:to="loc_tree_AssetPurchaseAgreementProceedsFromSale_A30BD51EE5185BBAA88C0B7BA8624F1A" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingencySettlementValue" xlink:label="loc_tree_LossContingencySettlementValue_79C4B7D1437B5633858E71D16B90B61F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_6B955876A26E51A9A5C79B2871D5CCA9" xlink:to="loc_tree_LossContingencySettlementValue_79C4B7D1437B5633858E71D16B90B61F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract_A684B6EA38A3544089753646CC32002F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_6B955876A26E51A9A5C79B2871D5CCA9" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract_A684B6EA38A3544089753646CC32002F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_BC73FE5A59885312A5039C2056395D47" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract_A684B6EA38A3544089753646CC32002F" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_BC73FE5A59885312A5039C2056395D47" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_7BCC9E7F203A55DF91733E39156A2D6B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract_A684B6EA38A3544089753646CC32002F" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_7BCC9E7F203A55DF91733E39156A2D6B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_DB5DF62E002857E7A237950AF9737C5B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract_A684B6EA38A3544089753646CC32002F" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_DB5DF62E002857E7A237950AF9737C5B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_2853768DC2CA510A8B50E7D8A520CE62" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract_A684B6EA38A3544089753646CC32002F" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_2853768DC2CA510A8B50E7D8A520CE62" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationBalanceSheetDisclosuresAbstract" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationBalanceSheetDisclosuresAbstract_7BDCCF5ECBBE56EDAFD5A6B2222A958C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_6B955876A26E51A9A5C79B2871D5CCA9" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationBalanceSheetDisclosuresAbstract_7BDCCF5ECBBE56EDAFD5A6B2222A958C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_CB883BD90D1751DC8D04484F821FC7A1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationBalanceSheetDisclosuresAbstract_7BDCCF5ECBBE56EDAFD5A6B2222A958C" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent_CB883BD90D1751DC8D04484F821FC7A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_D2915974785B532DA6DCCB4E3BEEBC12" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationBalanceSheetDisclosuresAbstract_7BDCCF5ECBBE56EDAFD5A6B2222A958C" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_D2915974785B532DA6DCCB4E3BEEBC12" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/DiscontinuedOperationsDetailsLoanLossObligations" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_B9F09D8ACADA5F8EB83D4AC393C62825" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_us-gaap_LossContingenciesTable_B9F09D8ACADA5F8EB83D4AC393C62825" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_A148AC43239A59BB912709EDADC166F8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_B9F09D8ACADA5F8EB83D4AC393C62825" xlink:to="loc_us-gaap_RangeAxis_A148AC43239A59BB912709EDADC166F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_273B3A2FE9620901B140FD6D5DEB2DAA_7177EAC867CA58E583262E1861275F5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_A148AC43239A59BB912709EDADC166F8" xlink:to="loc_us-gaap_RangeMember_273B3A2FE9620901B140FD6D5DEB2DAA_7177EAC867CA58E583262E1861275F5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_1E324C9ED1745739BAFF1E28A5E786D0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_A148AC43239A59BB912709EDADC166F8" xlink:to="loc_us-gaap_RangeMember_1E324C9ED1745739BAFF1E28A5E786D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_856E8083849A5967942AEA35EDCBB6D3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_1E324C9ED1745739BAFF1E28A5E786D0" xlink:to="loc_us-gaap_MinimumMember_856E8083849A5967942AEA35EDCBB6D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_779E7E09460B59EF9379F85411B2C2F1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_1E324C9ED1745739BAFF1E28A5E786D0" xlink:to="loc_us-gaap_MaximumMember_779E7E09460B59EF9379F85411B2C2F1" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_InvestorAxis" xlink:label="loc_tree_InvestorAxis_EB1EFEBDCEBD5A22A40A69AC14CC8C70" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_B9F09D8ACADA5F8EB83D4AC393C62825" xlink:to="loc_tree_InvestorAxis_EB1EFEBDCEBD5A22A40A69AC14CC8C70" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_InvestorDomain" xlink:label="loc_tree_InvestorDomain_A9B11652FA72BC1D3187FD6D5DEB6710_7177EAC867CA58E583262E1861275F5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_tree_InvestorAxis_EB1EFEBDCEBD5A22A40A69AC14CC8C70" xlink:to="loc_tree_InvestorDomain_A9B11652FA72BC1D3187FD6D5DEB6710_7177EAC867CA58E583262E1861275F5E" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_InvestorDomain" xlink:label="loc_tree_InvestorDomain_C29722376FFA5F568130A13092CFD781" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_tree_InvestorAxis_EB1EFEBDCEBD5A22A40A69AC14CC8C70" xlink:to="loc_tree_InvestorDomain_C29722376FFA5F568130A13092CFD781" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_InvestorOneMember" xlink:label="loc_tree_InvestorOneMember_D4679F07C44652E6BBFB91BFDAB72594" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_InvestorDomain_C29722376FFA5F568130A13092CFD781" xlink:to="loc_tree_InvestorOneMember_D4679F07C44652E6BBFB91BFDAB72594" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_InvestorTwoMember" xlink:label="loc_tree_InvestorTwoMember_2E2F7287D35F53F3BEEA2527C64B45FD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_InvestorDomain_C29722376FFA5F568130A13092CFD781" xlink:to="loc_tree_InvestorTwoMember_2E2F7287D35F53F3BEEA2527C64B45FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CounterpartyNameAxis" xlink:label="loc_us-gaap_CounterpartyNameAxis_F5AC99FD180057E2962FA3A3FC313CE9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_B9F09D8ACADA5F8EB83D4AC393C62825" xlink:to="loc_us-gaap_CounterpartyNameAxis_F5AC99FD180057E2962FA3A3FC313CE9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_F3C6F3F12BBFCD302775FD6D5DF28DC4_7177EAC867CA58E583262E1861275F5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CounterpartyNameAxis_F5AC99FD180057E2962FA3A3FC313CE9" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_F3C6F3F12BBFCD302775FD6D5DF28DC4_7177EAC867CA58E583262E1861275F5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_915553A24336566CB6752599F5769D90" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CounterpartyNameAxis_F5AC99FD180057E2962FA3A3FC313CE9" xlink:to="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_915553A24336566CB6752599F5769D90" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_DiscoverBankMember" xlink:label="loc_tree_DiscoverBankMember_82211A908A7D5FF0AF99AB074CBD21CD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_915553A24336566CB6752599F5769D90" xlink:to="loc_tree_DiscoverBankMember_82211A908A7D5FF0AF99AB074CBD21CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_2F44A21F25815E4291B4272173CFB2D5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_B9F09D8ACADA5F8EB83D4AC393C62825" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_2F44A21F25815E4291B4272173CFB2D5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_B553904C8182F863F20AFD6D5DF54A7E_7177EAC867CA58E583262E1861275F5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_2F44A21F25815E4291B4272173CFB2D5" xlink:to="loc_us-gaap_LossContingencyNatureDomain_B553904C8182F863F20AFD6D5DF54A7E_7177EAC867CA58E583262E1861275F5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyNatureDomain" xlink:label="loc_us-gaap_LossContingencyNatureDomain_A088D430D0C65AF2A51F6D1FA300FDFF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_2F44A21F25815E4291B4272173CFB2D5" xlink:to="loc_us-gaap_LossContingencyNatureDomain_A088D430D0C65AF2A51F6D1FA300FDFF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ObligationToRepurchaseReceivablesSoldMember" xlink:label="loc_us-gaap_ObligationToRepurchaseReceivablesSoldMember_CF813D8CC41E5FCB82A97767DC10F27B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_A088D430D0C65AF2A51F6D1FA300FDFF" xlink:to="loc_us-gaap_ObligationToRepurchaseReceivablesSoldMember_CF813D8CC41E5FCB82A97767DC10F27B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_C71CDC864EFB5486B955FD5F028E8E23" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_B9F09D8ACADA5F8EB83D4AC393C62825" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_C71CDC864EFB5486B955FD5F028E8E23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_B48E143002FCFC3181CBFD6D5DF65B67_7177EAC867CA58E583262E1861275F5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_C71CDC864EFB5486B955FD5F028E8E23" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_B48E143002FCFC3181CBFD6D5DF65B67_7177EAC867CA58E583262E1861275F5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_EE3B34CDE4A756CC956D398D692C7A64" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_C71CDC864EFB5486B955FD5F028E8E23" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_EE3B34CDE4A756CC956D398D692C7A64" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LendingTreeLoansMember" xlink:label="loc_tree_LendingTreeLoansMember_616AAFE5C21F56E5A8942C38F997B9F4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_EE3B34CDE4A756CC956D398D692C7A64" xlink:to="loc_tree_LendingTreeLoansMember_616AAFE5C21F56E5A8942C38F997B9F4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementOperatingActivitiesSegmentAxis" xlink:label="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_ABD7E13EC79F59359D5A558FB674B85B" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_B9F09D8ACADA5F8EB83D4AC393C62825" xlink:to="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_ABD7E13EC79F59359D5A558FB674B85B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentOperatingActivitiesDomain" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_A9DACC7DCF1A6AF70DDAFD6D5DF672E7_7177EAC867CA58E583262E1861275F5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_ABD7E13EC79F59359D5A558FB674B85B" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_A9DACC7DCF1A6AF70DDAFD6D5DF672E7_7177EAC867CA58E583262E1861275F5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentOperatingActivitiesDomain" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_5D1A199C74F55F4983B94686F393DEB6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_ABD7E13EC79F59359D5A558FB674B85B" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_5D1A199C74F55F4983B94686F393DEB6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentDiscontinuedOperationsMember" xlink:label="loc_us-gaap_SegmentDiscontinuedOperationsMember_BC654ABF7A5C5D61878CCCBEA4653105" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentOperatingActivitiesDomain_5D1A199C74F55F4983B94686F393DEB6" xlink:to="loc_us-gaap_SegmentDiscontinuedOperationsMember_BC654ABF7A5C5D61878CCCBEA4653105" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_5F4D641928B95C0FA87AFC495154F00F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_5F4D641928B95C0FA87AFC495154F00F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_239C47BF61AC5A99B5E3B6DC24190005" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_239C47BF61AC5A99B5E3B6DC24190005" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingenciesNumberofLoansSold" xlink:label="loc_tree_LossContingenciesNumberofLoansSold_4686886E0FFF53F69BA305046CD5B922" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_tree_LossContingenciesNumberofLoansSold_4686886E0FFF53F69BA305046CD5B922" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingenciesOriginalPrincipalBalance" xlink:label="loc_tree_LossContingenciesOriginalPrincipalBalance_77844D7FC9355CF398D96D49517E156C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_tree_LossContingenciesOriginalPrincipalBalance_77844D7FC9355CF398D96D49517E156C" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingenciesNumberofLoansSubsequentlySettled" xlink:label="loc_tree_LossContingenciesNumberofLoansSubsequentlySettled_7053AEEB12B154F5B686845085675101" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_tree_LossContingenciesNumberofLoansSubsequentlySettled_7053AEEB12B154F5B686845085675101" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingenciesValueofLoansSubsequentlySettled" xlink:label="loc_tree_LossContingenciesValueofLoansSubsequentlySettled_C284D0E3775854768390D02D622C106B" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_tree_LossContingenciesValueofLoansSubsequentlySettled_C284D0E3775854768390D02D622C106B" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingenciesNumberofUnsettledLoansRemaining" xlink:label="loc_tree_LossContingenciesNumberofUnsettledLoansRemaining_97B803D1B3DC5833838F405D60D6B148" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_tree_LossContingenciesNumberofUnsettledLoansRemaining_97B803D1B3DC5833838F405D60D6B148" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingenciesRemainingUnsettledLoans" xlink:label="loc_tree_LossContingenciesRemainingUnsettledLoans_AA22BF279CE35AC586D65DF3623D6E14" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_tree_LossContingenciesRemainingUnsettledLoans_AA22BF279CE35AC586D65DF3623D6E14" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingencySettlementValue" xlink:label="loc_tree_LossContingencySettlementValue_65B6FA1A79245785B0C1527D1F528D44" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_tree_LossContingencySettlementValue_65B6FA1A79245785B0C1527D1F528D44" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingenciesNumberofLoansSoldtooneinvestor" xlink:label="loc_tree_LossContingenciesNumberofLoansSoldtooneinvestor_763C272BFA26514DA8B45B3886300EB6" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_tree_LossContingenciesNumberofLoansSoldtooneinvestor_763C272BFA26514DA8B45B3886300EB6" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingenciesPercentageoftheOriginalLoanIssueBalance" xlink:label="loc_tree_LossContingenciesPercentageoftheOriginalLoanIssueBalance_4648625DB2665AA3B7A12863C06E680A" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_tree_LossContingenciesPercentageoftheOriginalLoanIssueBalance_4648625DB2665AA3B7A12863C06E680A" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingenciesSettlementNumberOfBuyersOfPreviouslyPurchasedLimitedDocumentationLoans" xlink:label="loc_tree_LossContingenciesSettlementNumberOfBuyersOfPreviouslyPurchasedLimitedDocumentationLoans_D983EE6A805B58FAB3E9877DFDD28DC9" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_tree_LossContingenciesSettlementNumberOfBuyersOfPreviouslyPurchasedLimitedDocumentationLoans_D983EE6A805B58FAB3E9877DFDD28DC9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_E72BF7715ED759F28040E4FCF15B6D76" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_E72BF7715ED759F28040E4FCF15B6D76" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyAccrualAtCarryingValue" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_A4988E4A83EC577B90FE8CEB8F2A0399" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_A4988E4A83EC577B90FE8CEB8F2A0399" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_GuaranteeObligationsNumberOfInvestorsToWhomLoansGuaranteed" xlink:label="loc_tree_GuaranteeObligationsNumberOfInvestorsToWhomLoansGuaranteed_12A16B35772857F7AD94E6780F5A5F07" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_tree_GuaranteeObligationsNumberOfInvestorsToWhomLoansGuaranteed_12A16B35772857F7AD94E6780F5A5F07" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyAccrualRollForward" xlink:label="loc_us-gaap_LossContingencyAccrualRollForward_37FABC9374AB579F80BBB5F38267F735" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_EDA7EEF73503506E85CFFBCB4C181101" xlink:to="loc_us-gaap_LossContingencyAccrualRollForward_37FABC9374AB579F80BBB5F38267F735" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyAccrualProvision" xlink:label="loc_us-gaap_LossContingencyAccrualProvision_9CC3DF4EE27F53E087D0B3E58656F877" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyAccrualRollForward_37FABC9374AB579F80BBB5F38267F735" xlink:to="loc_us-gaap_LossContingencyAccrualProvision_9CC3DF4EE27F53E087D0B3E58656F877" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LossContingencyAccrualCarryingValueChargeOffs" xlink:label="loc_tree_LossContingencyAccrualCarryingValueChargeOffs_F9634CC58B46508CA709566109C13F7A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyAccrualRollForward_37FABC9374AB579F80BBB5F38267F735" xlink:to="loc_tree_LossContingencyAccrualCarryingValueChargeOffs_F9634CC58B46508CA709566109C13F7A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/DiscontinuedOperationsNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/DiscontinuedOperationsTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_DC4EA3679BF4521792080B56430D2AE1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_9C077B4A05385060BA816D227C2420DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_DC4EA3679BF4521792080B56430D2AE1" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_9C077B4A05385060BA816D227C2420DF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_C31B18FE2BCD54EFA1B779CC43CB19DD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_9C077B4A05385060BA816D227C2420DF" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_C31B18FE2BCD54EFA1B779CC43CB19DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_FCC3133F3AABEBB031E839408E67FB2D_67685F02F54659429BF8DB0037A103CB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_C31B18FE2BCD54EFA1B779CC43CB19DD" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_FCC3133F3AABEBB031E839408E67FB2D_67685F02F54659429BF8DB0037A103CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_150D925C9A745822974655F0CC03A8A6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_C31B18FE2BCD54EFA1B779CC43CB19DD" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_150D925C9A745822974655F0CC03A8A6" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LendingTreeLoansMember" xlink:label="loc_tree_LendingTreeLoansMember_78ABD0A03AA2582089F7887890C92B08" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_150D925C9A745822974655F0CC03A8A6" xlink:to="loc_tree_LendingTreeLoansMember_78ABD0A03AA2582089F7887890C92B08" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementTableTextBlock" xlink:label="loc_tree_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementTableTextBlock_FF913C9529E755AE9DF60354520B39D7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_DC4EA3679BF4521792080B56430D2AE1" xlink:to="loc_tree_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsIncomeStatementTableTextBlock_FF913C9529E755AE9DF60354520B39D7" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ScheduleoftheNumberandIssueBalanceofLoansSoldandSubsequentSettlementsTableTextBlock" xlink:label="loc_tree_ScheduleoftheNumberandIssueBalanceofLoansSoldandSubsequentSettlementsTableTextBlock_1E1B481C75DB56EF875D64486F63A7B5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_DC4EA3679BF4521792080B56430D2AE1" xlink:to="loc_tree_ScheduleoftheNumberandIssueBalanceofLoansSoldandSubsequentSettlementsTableTextBlock_1E1B481C75DB56EF875D64486F63A7B5" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ScheduleOfActivityInLossReservesOnLoansSoldTableTextBlock" xlink:label="loc_tree_ScheduleOfActivityInLossReservesOnLoansSoldTableTextBlock_2399BD898E0D5FB5A807A8315E6E04E4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_DC4EA3679BF4521792080B56430D2AE1" xlink:to="loc_tree_ScheduleOfActivityInLossReservesOnLoansSoldTableTextBlock_2399BD898E0D5FB5A807A8315E6E04E4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/DocumentAndEntityInformation" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityInformationLineItems" xlink:label="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntitiesTable" xlink:label="loc_dei_EntitiesTable_6BAE2BE064765D01935378F6B225ED50" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:to="loc_dei_EntitiesTable_6BAE2BE064765D01935378F6B225ED50" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_7F46A07CFF8B5D828813AA0A4462DBD7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_6BAE2BE064765D01935378F6B225ED50" xlink:to="loc_dei_LegalEntityAxis_7F46A07CFF8B5D828813AA0A4462DBD7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_A563FE16205D6B42CFAD39408F666495_67685F02F54659429BF8DB0037A103CB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_7F46A07CFF8B5D828813AA0A4462DBD7" xlink:to="loc_dei_EntityDomain_A563FE16205D6B42CFAD39408F666495_67685F02F54659429BF8DB0037A103CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_614651399468583B873F27A80C4E1E88" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_7F46A07CFF8B5D828813AA0A4462DBD7" xlink:to="loc_dei_EntityDomain_614651399468583B873F27A80C4E1E88" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_01B19C607D855918850945865BB707F3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:to="loc_dei_EntityRegistrantName_01B19C607D855918850945865BB707F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_2267B098B942581EA019254560762FE3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:to="loc_dei_EntityCentralIndexKey_2267B098B942581EA019254560762FE3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_FD8F9531D5F253D3946C6CB180D21E2A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:to="loc_dei_DocumentType_FD8F9531D5F253D3946C6CB180D21E2A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_E8F8BCEA6FA156C2B3D8E553EB02F551" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:to="loc_dei_DocumentPeriodEndDate_E8F8BCEA6FA156C2B3D8E553EB02F551" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_2D42D8ECBFB754628F36FF3B53DF2A7E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:to="loc_dei_AmendmentFlag_2D42D8ECBFB754628F36FF3B53DF2A7E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_2295940320465609B8E23FC36768B57B" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:to="loc_dei_CurrentFiscalYearEndDate_2295940320465609B8E23FC36768B57B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_FB3B10DE4E2959E592C41277DB2504C6" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:to="loc_dei_EntityCurrentReportingStatus_FB3B10DE4E2959E592C41277DB2504C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_1B626922AFBF507588E744F1C28DB913" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:to="loc_dei_EntityFilerCategory_1B626922AFBF507588E744F1C28DB913" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_474AF2E62C7253AD8660E9480C80F0CB" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_474AF2E62C7253AD8660E9480C80F0CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_5DC909FD080955F8B480065BC66CAFBC" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:to="loc_dei_DocumentFiscalYearFocus_5DC909FD080955F8B480065BC66CAFBC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_6CDA01F15CE2576CB2E9498A59DEE76D" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_796A5CA33108558BB5FDC474CD16C872" xlink:to="loc_dei_DocumentFiscalPeriodFocus_6CDA01F15CE2576CB2E9498A59DEE76D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/FairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_1347E6A6467E6EFDBABB454E28A3AEBB" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_FA81AAF00B7FB5EBCC03454E289C6812" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_1347E6A6467E6EFDBABB454E28A3AEBB" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_FA81AAF00B7FB5EBCC03454E289C6812" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_A2BA0045048DA8F79FC0454E289DCF93" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_FA81AAF00B7FB5EBCC03454E289C6812" xlink:to="loc_us-gaap_RangeAxis_A2BA0045048DA8F79FC0454E289DCF93" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_1DE3C5B7DB6491FBE403454E289D0033_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_A2BA0045048DA8F79FC0454E289DCF93" xlink:to="loc_us-gaap_RangeMember_1DE3C5B7DB6491FBE403454E289D0033_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_1DE3C5B7DB6491FBE403454E289D0033" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_A2BA0045048DA8F79FC0454E289DCF93" xlink:to="loc_us-gaap_RangeMember_1DE3C5B7DB6491FBE403454E289D0033" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_A641ED02FE7719DA1699454E289DF177" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_1DE3C5B7DB6491FBE403454E289D0033" xlink:to="loc_us-gaap_MinimumMember_A641ED02FE7719DA1699454E289DF177" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_C3B16DEF57A2D633D875454E289D131B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_1DE3C5B7DB6491FBE403454E289D0033" xlink:to="loc_us-gaap_MaximumMember_C3B16DEF57A2D633D875454E289D131B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_AFC1A32F6B1180C15603454E28A3177F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_1347E6A6467E6EFDBABB454E28A3AEBB" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_AFC1A32F6B1180C15603454E28A3177F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_8F24907C60AC16608B8F454E28A3080A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_1347E6A6467E6EFDBABB454E28A3AEBB" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_8F24907C60AC16608B8F454E28A3080A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/FairValueMeasurementsNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/FairValueMeasurementsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/GoodwillAndIntangibleAssetsDetails5YrDefiniteLivedIntangiblesAmortization" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/GoodwillAndIntangibleAssetsDetailsBalanceSheet" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_050631F4EDE609EB177446F095BCBD68" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_3ACA2431A48E98C5813146F095BCAA5A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_050631F4EDE609EB177446F095BCBD68" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_3ACA2431A48E98C5813146F095BCAA5A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_9FF2E0F6B2D15938EF8346F095BCD068" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_3ACA2431A48E98C5813146F095BCAA5A" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_9FF2E0F6B2D15938EF8346F095BCD068" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1809D6FC4A6229E4D71946F095BC0EF1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9FF2E0F6B2D15938EF8346F095BCD068" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1809D6FC4A6229E4D71946F095BC0EF1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1809D6FC4A6229E4D71946F095BC0EF1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9FF2E0F6B2D15938EF8346F095BCD068" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1809D6FC4A6229E4D71946F095BC0EF1" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_QuoteWizardMember" xlink:label="loc_tree_QuoteWizardMember_C195BB475F67B40CC29846F095BC4FEA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1809D6FC4A6229E4D71946F095BC0EF1" xlink:to="loc_tree_QuoteWizardMember_C195BB475F67B40CC29846F095BC4FEA" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ValuePenguinMember" xlink:label="loc_tree_ValuePenguinMember_3F41158AE240AAC8BE7446F095BC1677" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1809D6FC4A6229E4D71946F095BC0EF1" xlink:to="loc_tree_ValuePenguinMember_3F41158AE240AAC8BE7446F095BC1677" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillPeriodIncreaseDecrease" xlink:label="loc_us-gaap_GoodwillPeriodIncreaseDecrease_D20757BBFF12258931B746F095BC3FDF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_050631F4EDE609EB177446F095BCBD68" xlink:to="loc_us-gaap_GoodwillPeriodIncreaseDecrease_D20757BBFF12258931B746F095BC3FDF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_93870F7A9913DBB58FB346F095BC619F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_050631F4EDE609EB177446F095BCBD68" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_93870F7A9913DBB58FB346F095BC619F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_C36E1B6EEF65F384862F46F095BC258C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_050631F4EDE609EB177446F095BCBD68" xlink:to="loc_us-gaap_GoodwillRollForward_C36E1B6EEF65F384862F46F095BC258C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillGross" xlink:label="loc_us-gaap_GoodwillGross_34440696B6789C16B61246F095BC79EC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_C36E1B6EEF65F384862F46F095BC258C" xlink:to="loc_us-gaap_GoodwillGross_34440696B6789C16B61246F095BC79EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_4B192406D02E835E4A0346F095BC665D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_C36E1B6EEF65F384862F46F095BC258C" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_4B192406D02E835E4A0346F095BC665D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_5753CEC61E59E681D9C646F095BCF662" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_C36E1B6EEF65F384862F46F095BC258C" xlink:to="loc_us-gaap_Goodwill_5753CEC61E59E681D9C646F095BCF662" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwillAbstract" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwillAbstract_D305C5D3030BD8DBF4EE46F095BCCC23" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_050631F4EDE609EB177446F095BCBD68" xlink:to="loc_us-gaap_IntangibleAssetsNetIncludingGoodwillAbstract_D305C5D3030BD8DBF4EE46F095BCCC23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_D5E51C61EE9DA29AA14446F095BCCE8C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetIncludingGoodwillAbstract_D305C5D3030BD8DBF4EE46F095BCCC23" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_D5E51C61EE9DA29AA14446F095BCCE8C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_71D01C3D0967ECE27D7346F095BC71A8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetIncludingGoodwillAbstract_D305C5D3030BD8DBF4EE46F095BCCC23" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_71D01C3D0967ECE27D7346F095BC71A8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_9D6DF5220B2B4FC0E59046F095BC8CB4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetIncludingGoodwillAbstract_D305C5D3030BD8DBF4EE46F095BCCC23" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_9D6DF5220B2B4FC0E59046F095BC8CB4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/GoodwillAndIntangibleAssetsDetailsDefiniteLivedIntangibles" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_897D22F90883D3E1D06D36135EF5A817" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_81FE013D70A2960A64D736135EF5E29E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_897D22F90883D3E1D06D36135EF5A817" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_81FE013D70A2960A64D736135EF5E29E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_0701BD8EB9AD0A671C8E36135EF5D125" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_81FE013D70A2960A64D736135EF5E29E" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_0701BD8EB9AD0A671C8E36135EF5D125" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7FBB7BA1F34030EEAD636135EF5FB26_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_0701BD8EB9AD0A671C8E36135EF5D125" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7FBB7BA1F34030EEAD636135EF5FB26_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7FBB7BA1F34030EEAD636135EF5FB26" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_0701BD8EB9AD0A671C8E36135EF5D125" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7FBB7BA1F34030EEAD636135EF5FB26" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_2D63135FA049092968E136135EF5EDF1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7FBB7BA1F34030EEAD636135EF5FB26" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_2D63135FA049092968E136135EF5EDF1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CustomerListsMember" xlink:label="loc_us-gaap_CustomerListsMember_3AB44DC5901F9F2B114F36135EF5FE1D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7FBB7BA1F34030EEAD636135EF5FB26" xlink:to="loc_us-gaap_CustomerListsMember_3AB44DC5901F9F2B114F36135EF5FE1D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TrademarksAndTradeNamesMember" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_C8CEEA0643FBC2F2CFA836135EF53F0D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7FBB7BA1F34030EEAD636135EF5FB26" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_C8CEEA0643FBC2F2CFA836135EF53F0D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MediaContentMember" xlink:label="loc_us-gaap_MediaContentMember_A0E6497FB2226202AA9E36135EF5D43F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7FBB7BA1F34030EEAD636135EF5FB26" xlink:to="loc_us-gaap_MediaContentMember_A0E6497FB2226202AA9E36135EF5D43F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherIntangibleAssetsMember" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_B6143812DE746D81FB3836135EF53260" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7FBB7BA1F34030EEAD636135EF5FB26" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_B6143812DE746D81FB3836135EF53260" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_5ABD18F720E7EBB4B00C36135EF5109A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_897D22F90883D3E1D06D36135EF5A817" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_5ABD18F720E7EBB4B00C36135EF5109A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_C2903CB71C0A02BCC5A436135EF532FD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_897D22F90883D3E1D06D36135EF5A817" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_C2903CB71C0A02BCC5A436135EF532FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_77490C12D6C94D24758D36135EF5B55C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_897D22F90883D3E1D06D36135EF5A817" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_77490C12D6C94D24758D36135EF5B55C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/GoodwillAndIntangibleAssetsDetailsGoodwillAndIndefiniteLivedIntangibles" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/GoodwillAndIntangibleAssetsNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/GoodwillAndIntangibleAssetsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/IncomeTaxesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/IncomeTaxesNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/IncomeTaxesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/LeasesLesseeOperatingLeasesSupplementalCashFlowInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_453E85168D6E504DACD85A5D19AE3AA6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_8A61D86C8957897D37895A5D19ACED47" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_453E85168D6E504DACD85A5D19AE3AA6" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_8A61D86C8957897D37895A5D19ACED47" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_F68AD171AB478E5FDB565A5D19ADED2F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_8A61D86C8957897D37895A5D19ACED47" xlink:to="loc_us-gaap_RangeAxis_F68AD171AB478E5FDB565A5D19ADED2F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_9941F7E73C3AB43BDFA85A5D19ADF1C8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_F68AD171AB478E5FDB565A5D19ADED2F" xlink:to="loc_us-gaap_RangeMember_9941F7E73C3AB43BDFA85A5D19ADF1C8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_9941F7E73C3AB43BDFA85A5D19ADF1C8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_F68AD171AB478E5FDB565A5D19ADED2F" xlink:to="loc_us-gaap_RangeMember_9941F7E73C3AB43BDFA85A5D19ADF1C8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_F184325DB149156BB2095A5D19AE2049" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_9941F7E73C3AB43BDFA85A5D19ADF1C8" xlink:to="loc_us-gaap_MinimumMember_F184325DB149156BB2095A5D19AE2049" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_A59C82BA5AC705816F175A5D19AEA3E7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_9941F7E73C3AB43BDFA85A5D19ADF1C8" xlink:to="loc_us-gaap_MaximumMember_A59C82BA5AC705816F175A5D19AEA3E7" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_LesseeOperatingLeaseNumberOfRenewalOptions" xlink:label="loc_tree_LesseeOperatingLeaseNumberOfRenewalOptions_1744EAD8BA631BFCEE105A5D19AE8F21" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_453E85168D6E504DACD85A5D19AE3AA6" xlink:to="loc_tree_LesseeOperatingLeaseNumberOfRenewalOptions_1744EAD8BA631BFCEE105A5D19AE8F21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LesseeLeasingArrangementsOperatingLeasesRenewalTerm" xlink:label="loc_us-gaap_LesseeLeasingArrangementsOperatingLeasesRenewalTerm_E36E003DDB40524753445A5D19AFE712" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_453E85168D6E504DACD85A5D19AE3AA6" xlink:to="loc_us-gaap_LesseeLeasingArrangementsOperatingLeasesRenewalTerm_E36E003DDB40524753445A5D19AFE712" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeaseLeaseIncome" xlink:label="loc_us-gaap_OperatingLeaseLeaseIncome_E4C3ED8C17B249F6B89C5A5D19AF30B7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_453E85168D6E504DACD85A5D19AE3AA6" xlink:to="loc_us-gaap_OperatingLeaseLeaseIncome_E4C3ED8C17B249F6B89C5A5D19AF30B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_63FCA9EFCBD9453C4FB55AB3B9C88830" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_453E85168D6E504DACD85A5D19AE3AA6" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_63FCA9EFCBD9453C4FB55AB3B9C88830" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_7555051192BC5EE5A08B5AB493027C91" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_453E85168D6E504DACD85A5D19AE3AA6" xlink:to="loc_us-gaap_OperatingLeaseLiability_7555051192BC5EE5A08B5AB493027C91" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/LeasesNotes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/LeasesOperatingLeaseMaturityDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/LeasesOperatingLeaseMaturityReceivableDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/LeasesSummaryOfLeaseExpenseAndWeightedAverageDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/LeasesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/OrganizationNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/RevenueDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_9619E6AADFAB69D7FE944C8AFE611B19" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_3C62FFABCC2AD71DBF294C8AFE580CD8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9619E6AADFAB69D7FE944C8AFE611B19" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_3C62FFABCC2AD71DBF294C8AFE580CD8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProductOrServiceAxis" xlink:label="loc_us-gaap_ProductOrServiceAxis_054D0C781817A5868EB24C8AFE5A2FBE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_3C62FFABCC2AD71DBF294C8AFE580CD8" xlink:to="loc_us-gaap_ProductOrServiceAxis_054D0C781817A5868EB24C8AFE5A2FBE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProductsAndServicesDomain" xlink:label="loc_us-gaap_ProductsAndServicesDomain_51A248F8A1C2FE5460EA4C8AFE5ADC44_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ProductOrServiceAxis_054D0C781817A5868EB24C8AFE5A2FBE" xlink:to="loc_us-gaap_ProductsAndServicesDomain_51A248F8A1C2FE5460EA4C8AFE5ADC44_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProductsAndServicesDomain" xlink:label="loc_us-gaap_ProductsAndServicesDomain_51A248F8A1C2FE5460EA4C8AFE5ADC44" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ProductOrServiceAxis_054D0C781817A5868EB24C8AFE5A2FBE" xlink:to="loc_us-gaap_ProductsAndServicesDomain_51A248F8A1C2FE5460EA4C8AFE5ADC44" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_MortgageProductsMember" xlink:label="loc_tree_MortgageProductsMember_F26CE1FB9236E79A3C8F4C8AFE5A59B0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_51A248F8A1C2FE5460EA4C8AFE5ADC44" xlink:to="loc_tree_MortgageProductsMember_F26CE1FB9236E79A3C8F4C8AFE5A59B0" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_CreditCardsMember" xlink:label="loc_tree_CreditCardsMember_542C9B8275C13091D3AF4C8AFE5B4E50" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_51A248F8A1C2FE5460EA4C8AFE5ADC44" xlink:to="loc_tree_CreditCardsMember_542C9B8275C13091D3AF4C8AFE5B4E50" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_PersonalLoansMember" xlink:label="loc_tree_PersonalLoansMember_83E9833BA0A9908F34044C8AFE5BE666" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_51A248F8A1C2FE5460EA4C8AFE5ADC44" xlink:to="loc_tree_PersonalLoansMember_83E9833BA0A9908F34044C8AFE5BE666" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_InsuranceMember" xlink:label="loc_tree_InsuranceMember_1B03D7A4CA38973FC4064C8AFE5BC77F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_51A248F8A1C2FE5460EA4C8AFE5ADC44" xlink:to="loc_tree_InsuranceMember_1B03D7A4CA38973FC4064C8AFE5BC77F" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_OtherProductsAndServicesMember" xlink:label="loc_tree_OtherProductsAndServicesMember_92781713A655179A79614C8AFE602C04" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_51A248F8A1C2FE5460EA4C8AFE5ADC44" xlink:to="loc_tree_OtherProductsAndServicesMember_92781713A655179A79614C8AFE602C04" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_NonmortgageProductsMember" xlink:label="loc_tree_NonmortgageProductsMember_1A837615812449E397B44C8AFE613F8C" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_51A248F8A1C2FE5460EA4C8AFE5ADC44" xlink:to="loc_tree_NonmortgageProductsMember_1A837615812449E397B44C8AFE613F8C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_94184C1B0641CD8B5F014C8AFE610760" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9619E6AADFAB69D7FE944C8AFE611B19" xlink:to="loc_us-gaap_Revenues_94184C1B0641CD8B5F014C8AFE610760" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerAssetNet" xlink:label="loc_us-gaap_ContractWithCustomerAssetNet_4462B1595D0996A4E5204C8AFE620A49" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9619E6AADFAB69D7FE944C8AFE611B19" xlink:to="loc_us-gaap_ContractWithCustomerAssetNet_4462B1595D0996A4E5204C8AFE620A49" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_A229513596ADD91D1F834C8AFE624522" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9619E6AADFAB69D7FE944C8AFE611B19" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_A229513596ADD91D1F834C8AFE624522" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_5597DC8A4F1C1E4FAE1A4C8AFE62A5E4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9619E6AADFAB69D7FE944C8AFE611B19" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_5597DC8A4F1C1E4FAE1A4C8AFE62A5E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueChangeInEstimateOfTransactionPrice" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueChangeInEstimateOfTransactionPrice_8DF6C0B1A38A3B336EE44C8B00D4A438" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_9619E6AADFAB69D7FE944C8AFE611B19" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueChangeInEstimateOfTransactionPrice_8DF6C0B1A38A3B336EE44C8B00D4A438" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/RevenueNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/RevenueScheduleOfRevenueTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/SegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_0243625303B1550EBA504ED57C1DEE83" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_F89DBDA1D3985169829EE14CBCEB371B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_0243625303B1550EBA504ED57C1DEE83" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_F89DBDA1D3985169829EE14CBCEB371B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProductOrServiceAxis" xlink:label="loc_us-gaap_ProductOrServiceAxis_909728576D5E5903BF7E9189CE713772" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_F89DBDA1D3985169829EE14CBCEB371B" xlink:to="loc_us-gaap_ProductOrServiceAxis_909728576D5E5903BF7E9189CE713772" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProductsAndServicesDomain" xlink:label="loc_us-gaap_ProductsAndServicesDomain_51772A4EA7358BD211A6AE4ECD6BD8B5_26EE75F018575ABDBB03DDF7AA052ABD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ProductOrServiceAxis_909728576D5E5903BF7E9189CE713772" xlink:to="loc_us-gaap_ProductsAndServicesDomain_51772A4EA7358BD211A6AE4ECD6BD8B5_26EE75F018575ABDBB03DDF7AA052ABD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProductsAndServicesDomain" xlink:label="loc_us-gaap_ProductsAndServicesDomain_927E2B20C74B579B86FA87AADC9FCD4A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ProductOrServiceAxis_909728576D5E5903BF7E9189CE713772" xlink:to="loc_us-gaap_ProductsAndServicesDomain_927E2B20C74B579B86FA87AADC9FCD4A" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_MortgageProductsMember" xlink:label="loc_tree_MortgageProductsMember_9D59D1FCF3375967A494033B6B75DBB1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_927E2B20C74B579B86FA87AADC9FCD4A" xlink:to="loc_tree_MortgageProductsMember_9D59D1FCF3375967A494033B6B75DBB1" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_NonmortgageProductsMember" xlink:label="loc_tree_NonmortgageProductsMember_F30E9A20B0F85B0198BCE82633BD4220" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_927E2B20C74B579B86FA87AADC9FCD4A" xlink:to="loc_tree_NonmortgageProductsMember_F30E9A20B0F85B0198BCE82633BD4220" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="loc_us-gaap_NumberOfReportableSegments_E501C8ED81C05B30AD5A1AFADCAB9862" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_0243625303B1550EBA504ED57C1DEE83" xlink:to="loc_us-gaap_NumberOfReportableSegments_E501C8ED81C05B30AD5A1AFADCAB9862" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_7552815C1E9F525E93F44EE5985F933A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_0243625303B1550EBA504ED57C1DEE83" xlink:to="loc_us-gaap_Revenues_7552815C1E9F525E93F44EE5985F933A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/SegmentInformationNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/SegmentInformationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/ShareholdersEquityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_628AB34284D6D31BBC6F5B1C70EA4559" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_AF3B6693752D5F4EAF935B1C70E95DD3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_628AB34284D6D31BBC6F5B1C70EA4559" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_AF3B6693752D5F4EAF935B1C70E95DD3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_625DD0F7A1D10F28B23B5B1C70E9DF59" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_AF3B6693752D5F4EAF935B1C70E95DD3" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_625DD0F7A1D10F28B23B5B1C70E9DF59" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_01618E78E11D97115D6C5B1C70E98E88_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_625DD0F7A1D10F28B23B5B1C70E9DF59" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_01618E78E11D97115D6C5B1C70E98E88_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_01618E78E11D97115D6C5B1C70E98E88" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_625DD0F7A1D10F28B23B5B1C70E9DF59" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_01618E78E11D97115D6C5B1C70E98E88" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_FF6A942E9A9CFB8AD3965B1C70EAFBA8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_01618E78E11D97115D6C5B1C70E98E88" xlink:to="loc_us-gaap_EmployeeStockOptionMember_FF6A942E9A9CFB8AD3965B1C70EAFBA8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_7F7F09CCA6F691803F435B1C70EA7C3C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_628AB34284D6D31BBC6F5B1C70EA4559" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_7F7F09CCA6F691803F435B1C70EA7C3C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/ShareholdersEquityNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/ShareholdersEquityTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/SignificantAccountingPoliciesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_DD618BBCD282EE687F644FC3B60703B7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_78650F112D7F67CF787B4FC3B606C27C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_DD618BBCD282EE687F644FC3B60703B7" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_78650F112D7F67CF787B4FC3B606C27C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_65C4951B5DA397A53A384FC3B606C66D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_78650F112D7F67CF787B4FC3B606C27C" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_65C4951B5DA397A53A384FC3B606C66D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_1607B367814D5339C8EA4FC3B60730F1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_65C4951B5DA397A53A384FC3B606C66D" xlink:to="loc_us-gaap_TypeOfAdoptionMember_1607B367814D5339C8EA4FC3B60730F1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_1607B367814D5339C8EA4FC3B60730F1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_65C4951B5DA397A53A384FC3B606C66D" xlink:to="loc_us-gaap_TypeOfAdoptionMember_1607B367814D5339C8EA4FC3B60730F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201602Member_8C53285C0349D35226AD4FC3B6074E1F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_1607B367814D5339C8EA4FC3B60730F1" xlink:to="loc_us-gaap_AccountingStandardsUpdate201602Member_8C53285C0349D35226AD4FC3B6074E1F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_57A832E7F4DEE22653304FC3B6070C8D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_DD618BBCD282EE687F644FC3B60703B7" xlink:to="loc_us-gaap_Assets_57A832E7F4DEE22653304FC3B6070C8D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_4D4AD78E3034850528434FC3B60810FA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_DD618BBCD282EE687F644FC3B60703B7" xlink:to="loc_us-gaap_Liabilities_4D4AD78E3034850528434FC3B60810FA" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/SignificantAccountingPoliciesNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/SignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/StockBasedCompensationDetailsPlImpact" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_29D135C0F59932BCB12545B7FF2FE4E2" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_908225134BA43148619645B7FF2B017D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_29D135C0F59932BCB12545B7FF2FE4E2" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_908225134BA43148619645B7FF2B017D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_CDA14F7FE31F163D103945B7FF2C2DCF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_908225134BA43148619645B7FF2B017D" xlink:to="loc_us-gaap_AwardTypeAxis_CDA14F7FE31F163D103945B7FF2C2DCF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0CE8323C84CCA2C8D93545B7FF2CED52_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_CDA14F7FE31F163D103945B7FF2C2DCF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0CE8323C84CCA2C8D93545B7FF2CED52_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0CE8323C84CCA2C8D93545B7FF2CED52" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_CDA14F7FE31F163D103945B7FF2C2DCF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0CE8323C84CCA2C8D93545B7FF2CED52" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_648F8908A9A7FF5FEE9745B7FF2CE92D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_908225134BA43148619645B7FF2B017D" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_648F8908A9A7FF5FEE9745B7FF2CE92D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_3E220DF68F027B2EC51A45B7FF2CF894_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_648F8908A9A7FF5FEE9745B7FF2CE92D" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_3E220DF68F027B2EC51A45B7FF2CF894_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_3E220DF68F027B2EC51A45B7FF2CF894" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_648F8908A9A7FF5FEE9745B7FF2CE92D" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_3E220DF68F027B2EC51A45B7FF2CF894" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_99AED16FDEF485D152E445B7FF2D2E96" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3E220DF68F027B2EC51A45B7FF2CF894" xlink:to="loc_us-gaap_CostOfSalesMember_99AED16FDEF485D152E445B7FF2D2E96" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_3742B3940F97DC254FF445B7FF2FA0B4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3E220DF68F027B2EC51A45B7FF2CF894" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_3742B3940F97DC254FF445B7FF2FA0B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_A05E6C7C0C5FFD33477445B7FF2FF0E9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3E220DF68F027B2EC51A45B7FF2CF894" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_A05E6C7C0C5FFD33477445B7FF2FF0E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_0D278BB4AF77C678653145B7FF2FF0DE" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3E220DF68F027B2EC51A45B7FF2CF894" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_0D278BB4AF77C678653145B7FF2FF0DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_E218ADE11F9C2BF09A8545B7FF301987" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_29D135C0F59932BCB12545B7FF2FE4E2" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_E218ADE11F9C2BF09A8545B7FF301987" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/StockBasedCompensationDetailsRsaRsuRollforwards" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1A3678207D15B1B8141D45B7FF047DA3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_43B75FA40CB9AF5250F945B7FF01D2CE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1A3678207D15B1B8141D45B7FF047DA3" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_43B75FA40CB9AF5250F945B7FF01D2CE" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_9668B3C86A29351F581A45B7FF02A99F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_43B75FA40CB9AF5250F945B7FF01D2CE" xlink:to="loc_us-gaap_AwardTypeAxis_9668B3C86A29351F581A45B7FF02A99F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02350DED1C2F42C161A145B7FF029001_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_9668B3C86A29351F581A45B7FF02A99F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02350DED1C2F42C161A145B7FF029001_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02350DED1C2F42C161A145B7FF029001" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_9668B3C86A29351F581A45B7FF02A99F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02350DED1C2F42C161A145B7FF029001" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_A79CE76EA1D98FCA706345B7FF026A53" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02350DED1C2F42C161A145B7FF029001" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_A79CE76EA1D98FCA706345B7FF026A53" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_01E5A4AF9E4962BE21BE45B7FF03B468" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02350DED1C2F42C161A145B7FF029001" xlink:to="loc_us-gaap_PerformanceSharesMember_01E5A4AF9E4962BE21BE45B7FF03B468" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_PerformanceBasedRestrictedStockMember" xlink:label="loc_tree_PerformanceBasedRestrictedStockMember_86FB45390B66B475789545B7FF035EB4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02350DED1C2F42C161A145B7FF029001" xlink:to="loc_tree_PerformanceBasedRestrictedStockMember_86FB45390B66B475789545B7FF035EB4" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_MarketBasedRestrictedStockMember" xlink:label="loc_tree_MarketBasedRestrictedStockMember_697F890D8C6306B1261C45B7FF04A43C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_02350DED1C2F42C161A145B7FF029001" xlink:to="loc_tree_MarketBasedRestrictedStockMember_697F890D8C6306B1261C45B7FF04A43C" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_PerformanceAwardsEarned" xlink:label="loc_tree_PerformanceAwardsEarned_3B4CC1B7DDD47EC42E5F45B7FF04D320" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1A3678207D15B1B8141D45B7FF047DA3" xlink:to="loc_tree_PerformanceAwardsEarned_3B4CC1B7DDD47EC42E5F45B7FF04D320" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_11A33E9B85185BE3F0F145B7FF05B55C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1A3678207D15B1B8141D45B7FF047DA3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_11A33E9B85185BE3F0F145B7FF05B55C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_EE36E0070999E475883845B7FF05EAB6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_11A33E9B85185BE3F0F145B7FF05B55C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_EE36E0070999E475883845B7FF05EAB6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_BD677D480A3E3E84D08845B7FF062E75" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_11A33E9B85185BE3F0F145B7FF05B55C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_BD677D480A3E3E84D08845B7FF062E75" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_FD3CA4C23F348D9FD02A45B7FF06EFA0" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_11A33E9B85185BE3F0F145B7FF05B55C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_FD3CA4C23F348D9FD02A45B7FF06EFA0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_FEE7F88E2C56A0D8D53545B7FF0648A2" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_11A33E9B85185BE3F0F145B7FF05B55C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_FEE7F88E2C56A0D8D53545B7FF0648A2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_D2BA1804D23C2808286A45B7FF072BDF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1A3678207D15B1B8141D45B7FF047DA3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_D2BA1804D23C2808286A45B7FF072BDF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9B4C0541164851E7BBDA45B7FF0793B1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_D2BA1804D23C2808286A45B7FF072BDF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9B4C0541164851E7BBDA45B7FF0793B1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_9AF8998C61C04112A8BB45B7FF072C2D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_D2BA1804D23C2808286A45B7FF072BDF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_9AF8998C61C04112A8BB45B7FF072C2D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_76182EB2268496ABC04B45B7FF070B2E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_D2BA1804D23C2808286A45B7FF072BDF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_76182EB2268496ABC04B45B7FF070B2E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_B6E2CCD6F57C9057963645B7FF07D43A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_D2BA1804D23C2808286A45B7FF072BDF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_B6E2CCD6F57C9057963645B7FF07D43A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/StockBasedCompensationDetailsStockOptionsRollforward" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C78A68FC969623A29DD546F094DC7643" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C96A43C03498FCD012E746F094DCD11A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C78A68FC969623A29DD546F094DC7643" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C96A43C03498FCD012E746F094DCD11A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VestingAxis" xlink:label="loc_us-gaap_VestingAxis_265F54220ECC7E50A7EF46F094DCCB0B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C96A43C03498FCD012E746F094DCD11A" xlink:to="loc_us-gaap_VestingAxis_265F54220ECC7E50A7EF46F094DCCB0B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_53017454CEBB8EDCF97846F094DCAC42_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_265F54220ECC7E50A7EF46F094DCCB0B" xlink:to="loc_us-gaap_VestingDomain_53017454CEBB8EDCF97846F094DCAC42_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_53017454CEBB8EDCF97846F094DCAC42" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_265F54220ECC7E50A7EF46F094DCCB0B" xlink:to="loc_us-gaap_VestingDomain_53017454CEBB8EDCF97846F094DCAC42" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_Tranche1Member" xlink:label="loc_tree_Tranche1Member_4D3B57F53BFDD465469046F094DC137A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_53017454CEBB8EDCF97846F094DCAC42" xlink:to="loc_tree_Tranche1Member_4D3B57F53BFDD465469046F094DC137A" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_Tranche2Member" xlink:label="loc_tree_Tranche2Member_014A4F3C10829079627246F094DCD5B9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_53017454CEBB8EDCF97846F094DCAC42" xlink:to="loc_tree_Tranche2Member_014A4F3C10829079627246F094DCD5B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_EE50A421981D10688E5E46F094DC745C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C96A43C03498FCD012E746F094DCD11A" xlink:to="loc_us-gaap_RangeAxis_EE50A421981D10688E5E46F094DC745C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_A700E72BA9FABD4CE1AB46F094DC4850_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_EE50A421981D10688E5E46F094DC745C" xlink:to="loc_us-gaap_RangeMember_A700E72BA9FABD4CE1AB46F094DC4850_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_A700E72BA9FABD4CE1AB46F094DC4850" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_EE50A421981D10688E5E46F094DC745C" xlink:to="loc_us-gaap_RangeMember_A700E72BA9FABD4CE1AB46F094DC4850" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_7D900C5AAD94DEC8736746F094DCFCF4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_A700E72BA9FABD4CE1AB46F094DC4850" xlink:to="loc_us-gaap_MinimumMember_7D900C5AAD94DEC8736746F094DCFCF4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_36653540384C0A5A100446F094DC61E6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_A700E72BA9FABD4CE1AB46F094DC4850" xlink:to="loc_us-gaap_MaximumMember_36653540384C0A5A100446F094DC61E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_6CDF6BD9D2D5B4E1651D46F094DC88ED" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C96A43C03498FCD012E746F094DCD11A" xlink:to="loc_us-gaap_AwardTypeAxis_6CDF6BD9D2D5B4E1651D46F094DC88ED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_F82052EC96AC65C7448446F094DCAB84_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_6CDF6BD9D2D5B4E1651D46F094DC88ED" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_F82052EC96AC65C7448446F094DCAB84_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_F82052EC96AC65C7448446F094DCAB84" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_6CDF6BD9D2D5B4E1651D46F094DC88ED" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_F82052EC96AC65C7448446F094DCAB84" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockCompensationPlanMember" xlink:label="loc_us-gaap_StockCompensationPlanMember_40CCE66EF843DC98968D46F094DC6DA3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_F82052EC96AC65C7448446F094DCAB84" xlink:to="loc_us-gaap_StockCompensationPlanMember_40CCE66EF843DC98968D46F094DC6DA3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_34B4D0F8750864EA579346F094DC5E5F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_F82052EC96AC65C7448446F094DCAB84" xlink:to="loc_us-gaap_EmployeeStockOptionMember_34B4D0F8750864EA579346F094DC5E5F" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_EmployeeStockOption2Member" xlink:label="loc_tree_EmployeeStockOption2Member_08F476F927B86994A78246F094DC7F2E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_F82052EC96AC65C7448446F094DCAB84" xlink:to="loc_tree_EmployeeStockOption2Member_08F476F927B86994A78246F094DC7F2E" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_PerformanceOptionsMember" xlink:label="loc_tree_PerformanceOptionsMember_31358483A5034D51C90546F094DC3911" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_F82052EC96AC65C7448446F094DCAB84" xlink:to="loc_tree_PerformanceOptionsMember_31358483A5034D51C90546F094DC3911" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_BEFEECF12E250363F4A946F094DC572E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C78A68FC969623A29DD546F094DC7643" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_BEFEECF12E250363F4A946F094DC572E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_14F611EA1768C1FE213146F094DC29F3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_BEFEECF12E250363F4A946F094DC572E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_14F611EA1768C1FE213146F094DC29F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_9BC3BF40F393C72E43B046F094DCDD11" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_BEFEECF12E250363F4A946F094DC572E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_9BC3BF40F393C72E43B046F094DCDD11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_99473A0699B6FDDC31FA46F094DC634E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_BEFEECF12E250363F4A946F094DC572E" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_99473A0699B6FDDC31FA46F094DC634E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_664C92D65BD02FCF68A346F094DC77D7" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_BEFEECF12E250363F4A946F094DC572E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_664C92D65BD02FCF68A346F094DC77D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_D69C7B15A668A099999B46F094DC0F4C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_BEFEECF12E250363F4A946F094DC572E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_D69C7B15A668A099999B46F094DC0F4C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_19B6B1F2235A203DEF9E46F094DCC528" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_BEFEECF12E250363F4A946F094DC572E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_19B6B1F2235A203DEF9E46F094DCC528" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_204136D8D99E831735D746F094DCBAFF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C78A68FC969623A29DD546F094DC7643" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_204136D8D99E831735D746F094DCBAFF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_E02B6E313C7C3C8CE5B546F094DCE646" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_204136D8D99E831735D746F094DCBAFF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_E02B6E313C7C3C8CE5B546F094DCE646" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_351C1DFC1FB29809FD9646F094DCEE4F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_204136D8D99E831735D746F094DCBAFF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_351C1DFC1FB29809FD9646F094DCEE4F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_B6CFA7E1DC569440885E46F094DCFA8C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_204136D8D99E831735D746F094DCBAFF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_B6CFA7E1DC569440885E46F094DCFA8C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_9E12EBC711EAA098B4C746F094DC8EF5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_204136D8D99E831735D746F094DCBAFF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_9E12EBC711EAA098B4C746F094DC8EF5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_D81BA321A5AA610EF11B46F094DC9625" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_204136D8D99E831735D746F094DCBAFF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_D81BA321A5AA610EF11B46F094DC9625" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_C0BD56E998ABA946C79746F094DC9514" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_204136D8D99E831735D746F094DCBAFF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_C0BD56E998ABA946C79746F094DC9514" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract" xlink:label="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_0E8EB6E7592DF86BF13546F094DC6671" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C78A68FC969623A29DD546F094DC7643" xlink:to="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_0E8EB6E7592DF86BF13546F094DC6671" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_5A773BFCA53FC14EBC9046F094DCD0BD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_0E8EB6E7592DF86BF13546F094DC6671" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_5A773BFCA53FC14EBC9046F094DCD0BD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_4BC4953C2C9FD487240346F094DC150F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_0E8EB6E7592DF86BF13546F094DC6671" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_4BC4953C2C9FD487240346F094DC150F" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract" xlink:label="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract_5F3B1CB2C70B05CBF3FF46F094DC48F6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C78A68FC969623A29DD546F094DC7643" xlink:to="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract_5F3B1CB2C70B05CBF3FF46F094DC48F6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_CD07B1C18D7A8505E97046F094DC8CBC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract_5F3B1CB2C70B05CBF3FF46F094DC48F6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_CD07B1C18D7A8505E97046F094DC8CBC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_6FDCE780B9DA0D38A7B346F094DC28F2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract_5F3B1CB2C70B05CBF3FF46F094DC48F6" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_6FDCE780B9DA0D38A7B346F094DC28F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C78A68FC969623A29DD546F094DC7643" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharePrice" xlink:label="loc_us-gaap_SharePrice_1F2E214BFE82A13DD4E546F094EBFF51" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:to="loc_us-gaap_SharePrice_1F2E214BFE82A13DD4E546F094EBFF51" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_DCB90003F2CB929B9EA546F094EB7DA4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_DCB90003F2CB929B9EA546F094EB7DA4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_9AE4DADDD15C2B6C90BD46F094EBDE27" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_9AE4DADDD15C2B6C90BD46F094EBDE27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermSimplifiedMethod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermSimplifiedMethod_BAD34DBE0A24B718B24146F094EB6E6E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermSimplifiedMethod_BAD34DBE0A24B718B24146F094EB6E6E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_E917D1DCA36F3D6E8A6D46F094EB3A05" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_E917D1DCA36F3D6E8A6D46F094EB3A05" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_28AEFA0ABAC4BD83C2CB46F094EBB3F3" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_28AEFA0ABAC4BD83C2CB46F094EBB3F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_3C5180451DAE7C2BBCB346F094EB002F" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_3C5180451DAE7C2BBCB346F094EB002F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_36B49EC37FFD5020BA3846F094EBD6DB" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_36B49EC37FFD5020BA3846F094EBD6DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_23280846DD350E2EE67E46F094EB3A50" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_23280846DD350E2EE67E46F094EB3A50" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_24D8061D3654E801C4D446F094EB3845" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_24D8061D3654E801C4D446F094EB3845" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_4F8EB59841C62AB0D0FF46F094EB6CE3" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_4F8EB59841C62AB0D0FF46F094EB6CE3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments_CA09933B47854CB81CA446F094EBF203" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_8DF04B381E9D5C17177646F094EBE7F3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments_CA09933B47854CB81CA446F094EBF203" xlink:type="arc" />
    <link:loc xlink:href="tree-20190331.xsd#tree_PerformanceAwardsEarned" xlink:label="loc_tree_PerformanceAwardsEarned_34A7E5DED38F4657CFF246F094EBC24B" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C78A68FC969623A29DD546F094DC7643" xlink:to="loc_tree_PerformanceAwardsEarned_34A7E5DED38F4657CFF246F094EBC24B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.tree.com/role/StockBasedCompensationNote" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.tree.com/role/StockBasedCompensationTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5F9ABE6F32D090788EC24549D8189297" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_40C58F080AF765FCFCA84549D80BFFF3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5F9ABE6F32D090788EC24549D8189297" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_40C58F080AF765FCFCA84549D80BFFF3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_DA96263F46954247F1B44549D80D97B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_40C58F080AF765FCFCA84549D80BFFF3" xlink:to="loc_us-gaap_PlanNameAxis_DA96263F46954247F1B44549D80D97B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_856206A676196C3B376A4549D80E8B1F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_DA96263F46954247F1B44549D80D97B7" xlink:to="loc_us-gaap_PlanNameDomain_856206A676196C3B376A4549D80E8B1F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_856206A676196C3B376A4549D80E8B1F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_DA96263F46954247F1B44549D80D97B7" xlink:to="loc_us-gaap_PlanNameDomain_856206A676196C3B376A4549D80E8B1F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardDateAxis" xlink:label="loc_us-gaap_AwardDateAxis_A4C52707F161262246054549D81010B8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_40C58F080AF765FCFCA84549D80BFFF3" xlink:to="loc_us-gaap_AwardDateAxis_A4C52707F161262246054549D81010B8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaap_AwardDateDomain_53DCC4FC03525E6A30814549D8108379_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardDateAxis_A4C52707F161262246054549D81010B8" xlink:to="loc_us-gaap_AwardDateDomain_53DCC4FC03525E6A30814549D8108379_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardDateDomain" xlink:label="loc_us-gaap_AwardDateDomain_53DCC4FC03525E6A30814549D8108379" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardDateAxis_A4C52707F161262246054549D81010B8" xlink:to="loc_us-gaap_AwardDateDomain_53DCC4FC03525E6A30814549D8108379" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_0BBB708E2173A0CBD8924549D811B95E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_40C58F080AF765FCFCA84549D80BFFF3" xlink:to="loc_us-gaap_AwardTypeAxis_0BBB708E2173A0CBD8924549D811B95E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_FAEB52A54949B6D3B80F4549D813AAF5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_0BBB708E2173A0CBD8924549D811B95E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_FAEB52A54949B6D3B80F4549D813AAF5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_FAEB52A54949B6D3B80F4549D813AAF5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_0BBB708E2173A0CBD8924549D811B95E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_FAEB52A54949B6D3B80F4549D813AAF5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_5CFBFD820C2E7401176F4549D8131AE8" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_40C58F080AF765FCFCA84549D80BFFF3" xlink:to="loc_us-gaap_StatementClassOfStockAxis_5CFBFD820C2E7401176F4549D8131AE8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_335626BE7E023B1087884549D8146A62_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_5CFBFD820C2E7401176F4549D8131AE8" xlink:to="loc_us-gaap_ClassOfStockDomain_335626BE7E023B1087884549D8146A62_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_335626BE7E023B1087884549D8146A62" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_5CFBFD820C2E7401176F4549D8131AE8" xlink:to="loc_us-gaap_ClassOfStockDomain_335626BE7E023B1087884549D8146A62" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_4376777FC9E6049DE1514549D815EEC4" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_40C58F080AF765FCFCA84549D80BFFF3" xlink:to="loc_us-gaap_RangeAxis_4376777FC9E6049DE1514549D815EEC4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_34DB10C82E7412ACC6864549D815B3F1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_4376777FC9E6049DE1514549D815EEC4" xlink:to="loc_us-gaap_RangeMember_34DB10C82E7412ACC6864549D815B3F1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_34DB10C82E7412ACC6864549D815B3F1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_4376777FC9E6049DE1514549D815EEC4" xlink:to="loc_us-gaap_RangeMember_34DB10C82E7412ACC6864549D815B3F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VestingAxis" xlink:label="loc_us-gaap_VestingAxis_DC176A7ED05DF7BC93914549D816F017" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_40C58F080AF765FCFCA84549D80BFFF3" xlink:to="loc_us-gaap_VestingAxis_DC176A7ED05DF7BC93914549D816F017" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_21EE2AFD4F889E649BDF4549D817073F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_DC176A7ED05DF7BC93914549D816F017" xlink:to="loc_us-gaap_VestingDomain_21EE2AFD4F889E649BDF4549D817073F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_21EE2AFD4F889E649BDF4549D817073F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_DC176A7ED05DF7BC93914549D816F017" xlink:to="loc_us-gaap_VestingDomain_21EE2AFD4F889E649BDF4549D817073F" xlink:type="arc" />
  </link:definitionLink>
</link:linkbase>