<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:7e723b70-c0dd-41ef-8a8d-2e448a0fe642,g:9a7c63b6-f903-40c2-8b67-a1a9f1958b17-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.tree.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITYUnaudited" xlink:type="simple" xlink:href="tree-20220630.xsd#CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITYUnaudited"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITYUnaudited" xlink:type="extended" id="icbad99552de44403802def176569e980_CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITYUnaudited">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_524e0ef1-0a48-4e3a-8cbf-7c2e75991ed0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_524e0ef1-0a48-4e3a-8cbf-7c2e75991ed0" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_c88458de-7580-4140-a185-c646508bd01d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:to="loc_us-gaap_StockholdersEquity_c88458de-7580-4140-a185-c646508bd01d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_7b2bf9bb-014b-495d-889e-210770552643" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:to="loc_us-gaap_SharesIssued_7b2bf9bb-014b-495d-889e-210770552643" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_e6b4d98f-d38f-4d2f-bca2-5064660ffc2f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:to="loc_us-gaap_TreasuryStockCommonShares_e6b4d98f-d38f-4d2f-bca2-5064660ffc2f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_d833a80d-d017-428d-9d58-70dee5a76fa5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:to="loc_us-gaap_NetIncomeLoss_d833a80d-d017-428d-9d58-70dee5a76fa5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_4d5f7b60-0f65-4374-86dd-8f1b5834d631" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_4d5f7b60-0f65-4374-86dd-8f1b5834d631" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_33f0b3a3-3898-4254-be7f-e0cbfb99f14e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_33f0b3a3-3898-4254-be7f-e0cbfb99f14e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_e92ed5a5-3c10-4e6b-9b62-792a4e63ec98" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_e92ed5a5-3c10-4e6b-9b62-792a4e63ec98" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_34503c62-38d0-46e3-bce8-9966190e6b5f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_34503c62-38d0-46e3-bce8-9966190e6b5f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_dbf953f0-74a0-4c41-a1ae-5710c1d7f484" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_dbf953f0-74a0-4c41-a1ae-5710c1d7f484" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_d79133ee-8eff-4bb6-a942-7416b9d20934" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_d79133ee-8eff-4bb6-a942-7416b9d20934" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityOther_7f4e6412-1fb2-4139-880e-06d337c57fde" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2bc714e3-9cf1-46b5-9968-794b47c09708" xlink:to="loc_us-gaap_StockholdersEquityOther_7f4e6412-1fb2-4139-880e-06d337c57fde" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_31f57f4a-3323-4d3a-b8ae-1123c0f86844" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_ae71a82b-39b5-4463-85eb-fe99a5cc5ead" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesIssued"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_b3eeaf26-8512-4b30-a0d1-01670937e8db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdateExtensibleList_4357e555-3ff0-4395-90a0-574972db0956" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountingStandardsUpdateExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_524e0ef1-0a48-4e3a-8cbf-7c2e75991ed0" xlink:to="loc_us-gaap_AccountingStandardsUpdateExtensibleList_4357e555-3ff0-4395-90a0-574972db0956" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_cc87fc11-a359-40b0-b165-8a02ca7c4934" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_524e0ef1-0a48-4e3a-8cbf-7c2e75991ed0" xlink:to="loc_us-gaap_StatementTable_cc87fc11-a359-40b0-b165-8a02ca7c4934" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_2bcda807-547a-40f4-9971-71670e2f0d19" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_cc87fc11-a359-40b0-b165-8a02ca7c4934" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_2bcda807-547a-40f4-9971-71670e2f0d19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_2bcda807-547a-40f4-9971-71670e2f0d19_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_2bcda807-547a-40f4-9971-71670e2f0d19" xlink:to="loc_us-gaap_EquityComponentDomain_2bcda807-547a-40f4-9971-71670e2f0d19_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_11602ba0-bfc7-43ac-b30f-ee2df3d3d349" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_2bcda807-547a-40f4-9971-71670e2f0d19" xlink:to="loc_us-gaap_EquityComponentDomain_11602ba0-bfc7-43ac-b30f-ee2df3d3d349" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_6e6b1367-5757-4bc0-afe8-e71728551535" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_11602ba0-bfc7-43ac-b30f-ee2df3d3d349" xlink:to="loc_us-gaap_CommonStockMember_6e6b1367-5757-4bc0-afe8-e71728551535" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_7aafad05-8d40-464c-adeb-d404513df1c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_11602ba0-bfc7-43ac-b30f-ee2df3d3d349" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_7aafad05-8d40-464c-adeb-d404513df1c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_4b1cee4b-c444-441e-bdfa-b735ea86b761" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_11602ba0-bfc7-43ac-b30f-ee2df3d3d349" xlink:to="loc_us-gaap_RetainedEarningsMember_4b1cee4b-c444-441e-bdfa-b735ea86b761" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_aaf1faf1-3a7a-48dd-8553-8cfca1dc41d8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_11602ba0-bfc7-43ac-b30f-ee2df3d3d349" xlink:to="loc_us-gaap_TreasuryStockCommonMember_aaf1faf1-3a7a-48dd-8553-8cfca1dc41d8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_948be7ce-2324-427b-9c6c-02c613e0568b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_cc87fc11-a359-40b0-b165-8a02ca7c4934" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_948be7ce-2324-427b-9c6c-02c613e0568b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_948be7ce-2324-427b-9c6c-02c613e0568b_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_948be7ce-2324-427b-9c6c-02c613e0568b" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_948be7ce-2324-427b-9c6c-02c613e0568b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_fce0ff5e-4fa7-4d4b-a905-badd59b66376" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_948be7ce-2324-427b-9c6c-02c613e0568b" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_fce0ff5e-4fa7-4d4b-a905-badd59b66376" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_11d4efc4-e722-423a-af79-c6ee8989642c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_fce0ff5e-4fa7-4d4b-a905-badd59b66376" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_11d4efc4-e722-423a-af79-c6ee8989642c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSUnauditedParenthetical" xlink:type="simple" xlink:href="tree-20220630.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWSUnauditedParenthetical"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSUnauditedParenthetical" xlink:type="extended" id="i26eb4a2cabd1408d9f3e3a525db1ea16_CONSOLIDATEDSTATEMENTSOFCASHFLOWSUnauditedParenthetical">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_bb506d35-bd6e-4f8d-83ff-31a686d29703" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_d9ff9fe1-112d-4ad0-bf2c-e16723eadd02" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_bb506d35-bd6e-4f8d-83ff-31a686d29703" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_d9ff9fe1-112d-4ad0-bf2c-e16723eadd02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_f05011a0-924d-4f6a-845d-0cc1bc239b4b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_bb506d35-bd6e-4f8d-83ff-31a686d29703" xlink:to="loc_us-gaap_StatementTable_f05011a0-924d-4f6a-845d-0cc1bc239b4b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_f406883e-4efd-4b5e-ad80-ef93ded57343" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_f05011a0-924d-4f6a-845d-0cc1bc239b4b" xlink:to="loc_us-gaap_DebtInstrumentAxis_f406883e-4efd-4b5e-ad80-ef93ded57343" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f406883e-4efd-4b5e-ad80-ef93ded57343_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_f406883e-4efd-4b5e-ad80-ef93ded57343" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f406883e-4efd-4b5e-ad80-ef93ded57343_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_2239f8c4-7a12-45bf-b6ff-e9c2e84c0aae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_f406883e-4efd-4b5e-ad80-ef93ded57343" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_2239f8c4-7a12-45bf-b6ff-e9c2e84c0aae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_A2022ConvertibleNotesMember_2f61ec22-f888-4aec-bd8d-d94053cbcd60" xlink:href="tree-20220630.xsd#tree_A2022ConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_2239f8c4-7a12-45bf-b6ff-e9c2e84c0aae" xlink:to="loc_tree_A2022ConvertibleNotesMember_2f61ec22-f888-4aec-bd8d-d94053cbcd60" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/SIGNIFICANTACCOUNTINGPOLICIESDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#SIGNIFICANTACCOUNTINGPOLICIESDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/SIGNIFICANTACCOUNTINGPOLICIESDetails" xlink:type="extended" id="i2cc11566141f47898ed654b7ee5e1ba6_SIGNIFICANTACCOUNTINGPOLICIESDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_5244c7fa-72c6-46b6-a7ff-d6dafa83cfef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_7f763341-a084-4085-8960-56feab133243" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_5244c7fa-72c6-46b6-a7ff-d6dafa83cfef" xlink:to="loc_us-gaap_StockholdersEquity_7f763341-a084-4085-8960-56feab133243" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_StockholdersEquityAttributableToParentBeforeTax_c9e55a29-bafc-440b-ad03-2815b56f707d" xlink:href="tree-20220630.xsd#tree_StockholdersEquityAttributableToParentBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_5244c7fa-72c6-46b6-a7ff-d6dafa83cfef" xlink:to="loc_tree_StockholdersEquityAttributableToParentBeforeTax_c9e55a29-bafc-440b-ad03-2815b56f707d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_StockholdersEquityAttributableToParentTax_7986a7cc-af6d-4a4a-bd2f-68deb7f0729b" xlink:href="tree-20220630.xsd#tree_StockholdersEquityAttributableToParentTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_5244c7fa-72c6-46b6-a7ff-d6dafa83cfef" xlink:to="loc_tree_StockholdersEquityAttributableToParentTax_7986a7cc-af6d-4a4a-bd2f-68deb7f0729b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_e05470d0-5847-4096-a92e-55c5f4088e49" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_5244c7fa-72c6-46b6-a7ff-d6dafa83cfef" xlink:to="loc_us-gaap_AssetsAbstract_e05470d0-5847-4096-a92e-55c5f4088e49" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_b2f5766b-664f-48d2-86bb-3596b2280f70" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_e05470d0-5847-4096-a92e-55c5f4088e49" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_b2f5766b-664f-48d2-86bb-3596b2280f70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_46075e07-2fcb-46a3-bb71-55dc7a285915" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_5244c7fa-72c6-46b6-a7ff-d6dafa83cfef" xlink:to="loc_us-gaap_LiabilitiesAbstract_46075e07-2fcb-46a3-bb71-55dc7a285915" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_d5267e0e-4be9-4a3d-9d6c-856d56be85da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_46075e07-2fcb-46a3-bb71-55dc7a285915" xlink:to="loc_us-gaap_LongTermDebtCurrent_d5267e0e-4be9-4a3d-9d6c-856d56be85da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_c5bf052b-1dce-4421-bca4-8884ad98843d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_46075e07-2fcb-46a3-bb71-55dc7a285915" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_c5bf052b-1dce-4421-bca4-8884ad98843d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_999665a2-6472-4380-a31d-d1feb90ae406" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_5244c7fa-72c6-46b6-a7ff-d6dafa83cfef" xlink:to="loc_us-gaap_StockholdersEquityAbstract_999665a2-6472-4380-a31d-d1feb90ae406" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_9755b470-4b8e-4f34-b794-391a232a1179" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_999665a2-6472-4380-a31d-d1feb90ae406" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_9755b470-4b8e-4f34-b794-391a232a1179" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_038659d7-593e-4d64-b44d-628df84d44c0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_999665a2-6472-4380-a31d-d1feb90ae406" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_038659d7-593e-4d64-b44d-628df84d44c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_677a7aa3-d65c-443e-8da4-6e3cc93429d1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_5244c7fa-72c6-46b6-a7ff-d6dafa83cfef" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_677a7aa3-d65c-443e-8da4-6e3cc93429d1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_6a73bf9f-1c3b-4ffb-9e33-ecd973398e7b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_677a7aa3-d65c-443e-8da4-6e3cc93429d1" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_6a73bf9f-1c3b-4ffb-9e33-ecd973398e7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_6a73bf9f-1c3b-4ffb-9e33-ecd973398e7b_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_6a73bf9f-1c3b-4ffb-9e33-ecd973398e7b" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_6a73bf9f-1c3b-4ffb-9e33-ecd973398e7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_ae3240f5-668e-43bb-9e93-58217e188c77" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_6a73bf9f-1c3b-4ffb-9e33-ecd973398e7b" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_ae3240f5-668e-43bb-9e93-58217e188c77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_15e7a765-44c1-4f92-b4a9-3cbbd0ddc9dc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_ae3240f5-668e-43bb-9e93-58217e188c77" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_15e7a765-44c1-4f92-b4a9-3cbbd0ddc9dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_c12f2765-246c-4216-b1dc-e6bde70643c0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_677a7aa3-d65c-443e-8da4-6e3cc93429d1" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_c12f2765-246c-4216-b1dc-e6bde70643c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_c12f2765-246c-4216-b1dc-e6bde70643c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_c12f2765-246c-4216-b1dc-e6bde70643c0" xlink:to="loc_us-gaap_EquityComponentDomain_c12f2765-246c-4216-b1dc-e6bde70643c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_554ea42b-30a8-456e-bcc3-254469ffd9b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_c12f2765-246c-4216-b1dc-e6bde70643c0" xlink:to="loc_us-gaap_EquityComponentDomain_554ea42b-30a8-456e-bcc3-254469ffd9b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_d1de12d0-f84a-4c22-abec-083f20f11f1c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_554ea42b-30a8-456e-bcc3-254469ffd9b3" xlink:to="loc_us-gaap_RetainedEarningsMember_d1de12d0-f84a-4c22-abec-083f20f11f1c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/REVENUEDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#REVENUEDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/REVENUEDisaggregationofRevenueDetails" xlink:type="extended" id="i3258e2a1aa564c868deb3ce643b862a4_REVENUEDisaggregationofRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_fb5136ed-79aa-443d-a4aa-be6b29d502fa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_733e4726-683c-4923-9500-541101ece37f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fb5136ed-79aa-443d-a4aa-be6b29d502fa" xlink:to="loc_us-gaap_Revenues_733e4726-683c-4923-9500-541101ece37f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_2467a718-7b8f-4fda-a9bb-17b429fd4582" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fb5136ed-79aa-443d-a4aa-be6b29d502fa" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_2467a718-7b8f-4fda-a9bb-17b429fd4582" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_c9346de0-b755-4dd0-9979-84221793c836" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_2467a718-7b8f-4fda-a9bb-17b429fd4582" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_c9346de0-b755-4dd0-9979-84221793c836" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_c9346de0-b755-4dd0-9979-84221793c836_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_c9346de0-b755-4dd0-9979-84221793c836" xlink:to="loc_us-gaap_SegmentDomain_c9346de0-b755-4dd0-9979-84221793c836_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_0e80568d-bf20-4a0c-a12e-82d9e1aa2bbf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_c9346de0-b755-4dd0-9979-84221793c836" xlink:to="loc_us-gaap_SegmentDomain_0e80568d-bf20-4a0c-a12e-82d9e1aa2bbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_HomeSegmentMember_0e485de6-7668-4692-96ee-f35b5eb3efaa" xlink:href="tree-20220630.xsd#tree_HomeSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0e80568d-bf20-4a0c-a12e-82d9e1aa2bbf" xlink:to="loc_tree_HomeSegmentMember_0e485de6-7668-4692-96ee-f35b5eb3efaa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_CreditCardsMember_057a021b-7800-46bd-8559-b15f07755645" xlink:href="tree-20220630.xsd#tree_CreditCardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_HomeSegmentMember_0e485de6-7668-4692-96ee-f35b5eb3efaa" xlink:to="loc_tree_CreditCardsMember_057a021b-7800-46bd-8559-b15f07755645" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_PersonalLoansMember_891a9d2f-5a6b-4fb7-ade5-d2b1e6176f7e" xlink:href="tree-20220630.xsd#tree_PersonalLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_HomeSegmentMember_0e485de6-7668-4692-96ee-f35b5eb3efaa" xlink:to="loc_tree_PersonalLoansMember_891a9d2f-5a6b-4fb7-ade5-d2b1e6176f7e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_OtherConsumerMember_d5f65ce8-ce31-45f4-9bfd-153d55e0df53" xlink:href="tree-20220630.xsd#tree_OtherConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_HomeSegmentMember_0e485de6-7668-4692-96ee-f35b5eb3efaa" xlink:to="loc_tree_OtherConsumerMember_d5f65ce8-ce31-45f4-9bfd-153d55e0df53" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ConsumerSegmentMember_c7bd74bb-159b-4674-8401-ccf50e35785e" xlink:href="tree-20220630.xsd#tree_ConsumerSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0e80568d-bf20-4a0c-a12e-82d9e1aa2bbf" xlink:to="loc_tree_ConsumerSegmentMember_c7bd74bb-159b-4674-8401-ccf50e35785e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_InsuranceSegmentMember_1c494087-1a45-4596-8417-0e721b809da0" xlink:href="tree-20220630.xsd#tree_InsuranceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0e80568d-bf20-4a0c-a12e-82d9e1aa2bbf" xlink:to="loc_tree_InsuranceSegmentMember_1c494087-1a45-4596-8417-0e721b809da0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_3dc33cb6-9817-4049-98a3-0221935987d8" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_2467a718-7b8f-4fda-a9bb-17b429fd4582" xlink:to="loc_srt_ProductOrServiceAxis_3dc33cb6-9817-4049-98a3-0221935987d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_3dc33cb6-9817-4049-98a3-0221935987d8_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_3dc33cb6-9817-4049-98a3-0221935987d8" xlink:to="loc_srt_ProductsAndServicesDomain_3dc33cb6-9817-4049-98a3-0221935987d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_3279a9ff-5388-4c6c-badb-d9df6e23f848" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_3dc33cb6-9817-4049-98a3-0221935987d8" xlink:to="loc_srt_ProductsAndServicesDomain_3279a9ff-5388-4c6c-badb-d9df6e23f848" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_OtherProductsAndServicesMember_edd95fd3-0deb-459f-a351-8f1af7a754c9" xlink:href="tree-20220630.xsd#tree_OtherProductsAndServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3279a9ff-5388-4c6c-badb-d9df6e23f848" xlink:to="loc_tree_OtherProductsAndServicesMember_edd95fd3-0deb-459f-a351-8f1af7a754c9" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/GOODWILLANDINTANGIBLEASSETSNarrativeDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#GOODWILLANDINTANGIBLEASSETSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/GOODWILLANDINTANGIBLEASSETSNarrativeDetails" xlink:type="extended" id="ib730d1275c1048bdb96d7fc65d5853f6_GOODWILLANDINTANGIBLEASSETSNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_864cac78-1fa6-410c-b57c-03ad93f49f13" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillGross_9323ba96-25e2-4fb3-b267-a8c35be68eae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_864cac78-1fa6-410c-b57c-03ad93f49f13" xlink:to="loc_us-gaap_GoodwillGross_9323ba96-25e2-4fb3-b267-a8c35be68eae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_8327b6eb-0c00-4575-baa7-5c380ce91cf2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_864cac78-1fa6-410c-b57c-03ad93f49f13" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_8327b6eb-0c00-4575-baa7-5c380ce91cf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_3d4ee0e9-eabc-4a7a-b63f-d57fe2d4127c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_864cac78-1fa6-410c-b57c-03ad93f49f13" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_3d4ee0e9-eabc-4a7a-b63f-d57fe2d4127c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_3be5b566-a8a0-4fdb-b189-e7a00265b6a4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_3d4ee0e9-eabc-4a7a-b63f-d57fe2d4127c" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_3be5b566-a8a0-4fdb-b189-e7a00265b6a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_3be5b566-a8a0-4fdb-b189-e7a00265b6a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3be5b566-a8a0-4fdb-b189-e7a00265b6a4" xlink:to="loc_us-gaap_SegmentDomain_3be5b566-a8a0-4fdb-b189-e7a00265b6a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a7d8565e-d1a9-4244-b6eb-7ef5c6e5b4af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3be5b566-a8a0-4fdb-b189-e7a00265b6a4" xlink:to="loc_us-gaap_SegmentDomain_a7d8565e-d1a9-4244-b6eb-7ef5c6e5b4af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_HomeSegmentMember_0be784a0-e48d-4e88-8c92-fd391116555f" xlink:href="tree-20220630.xsd#tree_HomeSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a7d8565e-d1a9-4244-b6eb-7ef5c6e5b4af" xlink:to="loc_tree_HomeSegmentMember_0be784a0-e48d-4e88-8c92-fd391116555f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ConsumerSegmentMember_bc2522be-8ead-4ebf-91e0-2d2e866dc5f5" xlink:href="tree-20220630.xsd#tree_ConsumerSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a7d8565e-d1a9-4244-b6eb-7ef5c6e5b4af" xlink:to="loc_tree_ConsumerSegmentMember_bc2522be-8ead-4ebf-91e0-2d2e866dc5f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_InsuranceSegmentMember_2a8b42de-e9e0-405d-99b9-2dfe148aac7c" xlink:href="tree-20220630.xsd#tree_InsuranceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a7d8565e-d1a9-4244-b6eb-7ef5c6e5b4af" xlink:to="loc_tree_InsuranceSegmentMember_2a8b42de-e9e0-405d-99b9-2dfe148aac7c" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetswithDefiniteLivesDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetswithDefiniteLivesDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetswithDefiniteLivesDetails" xlink:type="extended" id="iaf6797faa23444969f94d4ab39b9e626_GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetswithDefiniteLivesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1147445e-2d33-4836-9551-affcc996a823" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_455c3ecc-8be4-4689-adc8-c3e9d5000431" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1147445e-2d33-4836-9551-affcc996a823" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_455c3ecc-8be4-4689-adc8-c3e9d5000431" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_ec1ce3eb-eaf0-4c5a-8ba8-3253ebbeacc0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1147445e-2d33-4836-9551-affcc996a823" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_ec1ce3eb-eaf0-4c5a-8ba8-3253ebbeacc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_d4df4ee7-c4dc-4306-b8d9-4e24a93c210a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1147445e-2d33-4836-9551-affcc996a823" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_d4df4ee7-c4dc-4306-b8d9-4e24a93c210a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_25656c3c-2b33-446c-8516-852da702a34f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_1147445e-2d33-4836-9551-affcc996a823" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_25656c3c-2b33-446c-8516-852da702a34f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a271d2f4-215a-44e7-af4c-bd169312b1f0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_25656c3c-2b33-446c-8516-852da702a34f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a271d2f4-215a-44e7-af4c-bd169312b1f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a271d2f4-215a-44e7-af4c-bd169312b1f0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a271d2f4-215a-44e7-af4c-bd169312b1f0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a271d2f4-215a-44e7-af4c-bd169312b1f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7cdc1f85-4997-4587-a248-920a78413aa7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a271d2f4-215a-44e7-af4c-bd169312b1f0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7cdc1f85-4997-4587-a248-920a78413aa7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_3d1fb20f-9c33-4fe2-ae40-2eff92237be0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TechnologyBasedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7cdc1f85-4997-4587-a248-920a78413aa7" xlink:to="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_3d1fb20f-9c33-4fe2-ae40-2eff92237be0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerListsMember_f1e54d12-ff6d-48a3-aa31-b8d37af5e46a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerListsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7cdc1f85-4997-4587-a248-920a78413aa7" xlink:to="loc_us-gaap_CustomerListsMember_f1e54d12-ff6d-48a3-aa31-b8d37af5e46a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_4247aa8d-6e1d-4f91-b9dc-568a70a46da1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7cdc1f85-4997-4587-a248-920a78413aa7" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_4247aa8d-6e1d-4f91-b9dc-568a70a46da1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MediaContentMember_6475d31a-39c0-46de-ba52-b9fc5af89d0e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MediaContentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7cdc1f85-4997-4587-a248-920a78413aa7" xlink:to="loc_us-gaap_MediaContentMember_6475d31a-39c0-46de-ba52-b9fc5af89d0e" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/EQUITYINVESTMENTDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#EQUITYINVESTMENTDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/EQUITYINVESTMENTDetails" xlink:type="extended" id="i51660d0805b2402baca99c65c62a08c3_EQUITYINVESTMENTDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_392bc5c9-e15c-48e2-8e08-a72748e5f34d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentAggregateCost_2e942dd6-84c4-455d-8232-5ca1eb03115a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentAggregateCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_392bc5c9-e15c-48e2-8e08-a72748e5f34d" xlink:to="loc_us-gaap_EquityMethodInvestmentAggregateCost_2e942dd6-84c4-455d-8232-5ca1eb03115a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_3c8bdce7-3feb-44a8-afd2-b491cc80eb08" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromSaleOfEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_392bc5c9-e15c-48e2-8e08-a72748e5f34d" xlink:to="loc_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_3c8bdce7-3feb-44a8-afd2-b491cc80eb08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal_99c6cc55-533e-485c-ba50-c2481d1cb11e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_392bc5c9-e15c-48e2-8e08-a72748e5f34d" xlink:to="loc_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal_99c6cc55-533e-485c-ba50-c2481d1cb11e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_15b9bd24-5b59-46be-bacd-5087533e069f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_392bc5c9-e15c-48e2-8e08-a72748e5f34d" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_15b9bd24-5b59-46be-bacd-5087533e069f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossCumulativeAmount_7ca886ce-59c4-4cff-ac8a-ed48dd4ce12d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossCumulativeAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_392bc5c9-e15c-48e2-8e08-a72748e5f34d" xlink:to="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossCumulativeAmount_7ca886ce-59c4-4cff-ac8a-ed48dd4ce12d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5f2be80a-4aa0-463d-9acb-a6b2e6c25d49" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_392bc5c9-e15c-48e2-8e08-a72748e5f34d" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5f2be80a-4aa0-463d-9acb-a6b2e6c25d49" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_778e1fa0-6638-4e26-a302-44d0291d5c45" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5f2be80a-4aa0-463d-9acb-a6b2e6c25d49" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_778e1fa0-6638-4e26-a302-44d0291d5c45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_778e1fa0-6638-4e26-a302-44d0291d5c45_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_778e1fa0-6638-4e26-a302-44d0291d5c45" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_778e1fa0-6638-4e26-a302-44d0291d5c45_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_88915028-84f3-4077-bb99-c657bf884883" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_778e1fa0-6638-4e26-a302-44d0291d5c45" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_88915028-84f3-4077-bb99-c657bf884883" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_EarnUpIncMember_2a043cb8-7644-49ed-afdf-d13a27ff74df" xlink:href="tree-20220630.xsd#tree_EarnUpIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_88915028-84f3-4077-bb99-c657bf884883" xlink:to="loc_tree_EarnUpIncMember_2a043cb8-7644-49ed-afdf-d13a27ff74df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_StashFinancialInc.Member_1e73a9f3-1022-4a00-9da5-95f6ec516319" xlink:href="tree-20220630.xsd#tree_StashFinancialInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_88915028-84f3-4077-bb99-c657bf884883" xlink:to="loc_tree_StashFinancialInc.Member_1e73a9f3-1022-4a00-9da5-95f6ec516319" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/SHAREHOLDERSEQUITYDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#SHAREHOLDERSEQUITYDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/SHAREHOLDERSEQUITYDetails" xlink:type="extended" id="id27fc0b1282d4538a1694b7fa4e5f22c_SHAREHOLDERSEQUITYDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_c0bb8008-ab2e-480a-a4bc-a451f8507703" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_9cb11f2a-6fdf-4142-b8d0-5a253c1ef254" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_c0bb8008-ab2e-480a-a4bc-a451f8507703" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_9cb11f2a-6fdf-4142-b8d0-5a253c1ef254" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_626b1ba5-56f2-4641-a259-8811adbf1e1a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_9cb11f2a-6fdf-4142-b8d0-5a253c1ef254" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_626b1ba5-56f2-4641-a259-8811adbf1e1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_648a5154-6f2b-47c0-836f-68821c76b5db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_9cb11f2a-6fdf-4142-b8d0-5a253c1ef254" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_648a5154-6f2b-47c0-836f-68821c76b5db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_IncrementalCommonSharesAttributableToRestrictedStockUnits_0e0a7375-b56b-43e7-bf2a-57b9b9698387" xlink:href="tree-20220630.xsd#tree_IncrementalCommonSharesAttributableToRestrictedStockUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_9cb11f2a-6fdf-4142-b8d0-5a253c1ef254" xlink:to="loc_tree_IncrementalCommonSharesAttributableToRestrictedStockUnits_0e0a7375-b56b-43e7-bf2a-57b9b9698387" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants_0e12f08c-9580-48e4-a75b-7789a7c19d0b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_9cb11f2a-6fdf-4142-b8d0-5a253c1ef254" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants_0e12f08c-9580-48e4-a75b-7789a7c19d0b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_bc28a6b2-e634-4d6c-a888-298f95a5d5a0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_9cb11f2a-6fdf-4142-b8d0-5a253c1ef254" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_bc28a6b2-e634-4d6c-a888-298f95a5d5a0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedOtherDisclosuresAbstract_378e276d-f984-4867-9e75-4b70ff98218c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareDilutedOtherDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_c0bb8008-ab2e-480a-a4bc-a451f8507703" xlink:to="loc_us-gaap_EarningsPerShareDilutedOtherDisclosuresAbstract_378e276d-f984-4867-9e75-4b70ff98218c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_32433345-59ff-4161-8dac-5fc343ada8d3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedOtherDisclosuresAbstract_378e276d-f984-4867-9e75-4b70ff98218c" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_32433345-59ff-4161-8dac-5fc343ada8d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_d14abd1c-f628-44ef-984f-0bc9361d85ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedOtherDisclosuresAbstract_378e276d-f984-4867-9e75-4b70ff98218c" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_d14abd1c-f628-44ef-984f-0bc9361d85ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfRepurchaseAgreementsAbstract_8ea3ce1a-60bc-420a-8514-03b2cdab65b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisclosureOfRepurchaseAgreementsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_c0bb8008-ab2e-480a-a4bc-a451f8507703" xlink:to="loc_us-gaap_DisclosureOfRepurchaseAgreementsAbstract_8ea3ce1a-60bc-420a-8514-03b2cdab65b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_de6c9f05-cfba-4818-aeff-2a0b3a73d4a3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisclosureOfRepurchaseAgreementsAbstract_8ea3ce1a-60bc-420a-8514-03b2cdab65b3" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_de6c9f05-cfba-4818-aeff-2a0b3a73d4a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_a22fecd4-9fa2-49ba-923d-8e38e41b8dd1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisclosureOfRepurchaseAgreementsAbstract_8ea3ce1a-60bc-420a-8514-03b2cdab65b3" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_a22fecd4-9fa2-49ba-923d-8e38e41b8dd1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_0d811e57-007b-478a-b0d4-498778cc714a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisclosureOfRepurchaseAgreementsAbstract_8ea3ce1a-60bc-420a-8514-03b2cdab65b3" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_0d811e57-007b-478a-b0d4-498778cc714a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_ec0f46a8-30f2-4c62-9640-1a86220d1823" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_c0bb8008-ab2e-480a-a4bc-a451f8507703" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_ec0f46a8-30f2-4c62-9640-1a86220d1823" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6bc4400d-4dcd-49c5-aee6-c377ee0a9780" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_ec0f46a8-30f2-4c62-9640-1a86220d1823" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6bc4400d-4dcd-49c5-aee6-c377ee0a9780" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_6bc4400d-4dcd-49c5-aee6-c377ee0a9780_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6bc4400d-4dcd-49c5-aee6-c377ee0a9780" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_6bc4400d-4dcd-49c5-aee6-c377ee0a9780_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_874245c0-f2fb-4bac-8553-25cd6b31023a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_6bc4400d-4dcd-49c5-aee6-c377ee0a9780" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_874245c0-f2fb-4bac-8553-25cd6b31023a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_843fadb1-109b-484e-8c26-43535a0cd3d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_874245c0-f2fb-4bac-8553-25cd6b31023a" xlink:to="loc_us-gaap_EmployeeStockOptionMember_843fadb1-109b-484e-8c26-43535a0cd3d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_3f938943-8496-40d2-80d3-9866d1cd9ded" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_874245c0-f2fb-4bac-8553-25cd6b31023a" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_3f938943-8496-40d2-80d3-9866d1cd9ded" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_f7b92cb1-9c34-4758-91e7-28b0acbca0c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_874245c0-f2fb-4bac-8553-25cd6b31023a" xlink:to="loc_us-gaap_ConvertibleDebtMember_f7b92cb1-9c34-4758-91e7-28b0acbca0c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_f98bc1d8-40d1-4730-96f0-a82f7aa7854d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_ec0f46a8-30f2-4c62-9640-1a86220d1823" xlink:to="loc_us-gaap_DebtInstrumentAxis_f98bc1d8-40d1-4730-96f0-a82f7aa7854d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f98bc1d8-40d1-4730-96f0-a82f7aa7854d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_f98bc1d8-40d1-4730-96f0-a82f7aa7854d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f98bc1d8-40d1-4730-96f0-a82f7aa7854d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a7670b2c-b154-4bd2-a5ff-264c1bb3f2cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_f98bc1d8-40d1-4730-96f0-a82f7aa7854d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a7670b2c-b154-4bd2-a5ff-264c1bb3f2cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_A2025ConvertibleNotesMember_5592d7b4-c613-4416-92cb-ba1ead855148" xlink:href="tree-20220630.xsd#tree_A2025ConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a7670b2c-b154-4bd2-a5ff-264c1bb3f2cb" xlink:to="loc_tree_A2025ConvertibleNotesMember_5592d7b4-c613-4416-92cb-ba1ead855148" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_A2022ConvertibleNotesMember_2b6cc84b-4108-4cab-9c20-0590950cb117" xlink:href="tree-20220630.xsd#tree_A2022ConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a7670b2c-b154-4bd2-a5ff-264c1bb3f2cb" xlink:to="loc_tree_A2022ConvertibleNotesMember_2b6cc84b-4108-4cab-9c20-0590950cb117" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_dc55ae11-eafc-456c-b54e-953b31b381ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_ec0f46a8-30f2-4c62-9640-1a86220d1823" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_dc55ae11-eafc-456c-b54e-953b31b381ec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_dc55ae11-eafc-456c-b54e-953b31b381ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_dc55ae11-eafc-456c-b54e-953b31b381ec" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_dc55ae11-eafc-456c-b54e-953b31b381ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0bf98692-2eba-4fae-b582-9c3df4b5dba0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_dc55ae11-eafc-456c-b54e-953b31b381ec" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0bf98692-2eba-4fae-b582-9c3df4b5dba0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_41ab9879-becb-4cff-aeda-4117bcc59c61" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0bf98692-2eba-4fae-b582-9c3df4b5dba0" xlink:to="loc_us-gaap_ConvertibleDebtMember_41ab9879-becb-4cff-aeda-4117bcc59c61" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/STOCKBASEDCOMPENSATIONScheduleofNoncashCompensationRelatedtoEquityAwardsDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#STOCKBASEDCOMPENSATIONScheduleofNoncashCompensationRelatedtoEquityAwardsDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/STOCKBASEDCOMPENSATIONScheduleofNoncashCompensationRelatedtoEquityAwardsDetails" xlink:type="extended" id="i27de1d191e8549c18349766a7eae7bed_STOCKBASEDCOMPENSATIONScheduleofNoncashCompensationRelatedtoEquityAwardsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_181081a5-a3bd-4be2-a813-221d4b1396e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_40b75763-adf0-4b25-82e7-c637dff8b8bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_181081a5-a3bd-4be2-a813-221d4b1396e6" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_40b75763-adf0-4b25-82e7-c637dff8b8bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_1616d608-ded1-4ea4-8d6b-91df5c2856e8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_181081a5-a3bd-4be2-a813-221d4b1396e6" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_1616d608-ded1-4ea4-8d6b-91df5c2856e8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_890d5b89-28ce-475f-abf2-23fd79497fa6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_1616d608-ded1-4ea4-8d6b-91df5c2856e8" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_890d5b89-28ce-475f-abf2-23fd79497fa6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_890d5b89-28ce-475f-abf2-23fd79497fa6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_890d5b89-28ce-475f-abf2-23fd79497fa6" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_890d5b89-28ce-475f-abf2-23fd79497fa6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_765f62b2-5b96-4e29-89e3-4f6bc314ca63" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_890d5b89-28ce-475f-abf2-23fd79497fa6" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_765f62b2-5b96-4e29-89e3-4f6bc314ca63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_c3555d81-5db8-4a64-aa6f-9ed933910959" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_765f62b2-5b96-4e29-89e3-4f6bc314ca63" xlink:to="loc_us-gaap_CostOfSalesMember_c3555d81-5db8-4a64-aa6f-9ed933910959" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_12711e1a-78eb-4a51-bc6d-393547b97a21" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_765f62b2-5b96-4e29-89e3-4f6bc314ca63" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_12711e1a-78eb-4a51-bc6d-393547b97a21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_2b188af4-590e-4f4e-bc05-3373308359da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_765f62b2-5b96-4e29-89e3-4f6bc314ca63" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_2b188af4-590e-4f4e-bc05-3373308359da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_49b29b46-879d-4656-b090-cd93032d5473" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_765f62b2-5b96-4e29-89e3-4f6bc314ca63" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_49b29b46-879d-4656-b090-cd93032d5473" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringChargesMember_194cc20a-3492-4e7c-b930-fcd9088eeea7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringChargesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_765f62b2-5b96-4e29-89e3-4f6bc314ca63" xlink:to="loc_us-gaap_RestructuringChargesMember_194cc20a-3492-4e7c-b930-fcd9088eeea7" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/STOCKBASEDCOMPENSATIONSummaryofStockOptionsandStockOptionswithMarketConditionsDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#STOCKBASEDCOMPENSATIONSummaryofStockOptionsandStockOptionswithMarketConditionsDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/STOCKBASEDCOMPENSATIONSummaryofStockOptionsandStockOptionswithMarketConditionsDetails" xlink:type="extended" id="ic028616ea6f2472baeae361aaad543d4_STOCKBASEDCOMPENSATIONSummaryofStockOptionsandStockOptionswithMarketConditionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7899aca2-8a83-4444-b6dc-b8805b118a45" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e29dfdf7-596d-4a71-8612-ac2c5b18673f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7899aca2-8a83-4444-b6dc-b8805b118a45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e29dfdf7-596d-4a71-8612-ac2c5b18673f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_a4af35e1-2b3a-4c8e-ab89-c492d0c14d9c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e29dfdf7-596d-4a71-8612-ac2c5b18673f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_a4af35e1-2b3a-4c8e-ab89-c492d0c14d9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_2dbc6685-5712-4f6d-9e61-27c4628ed5d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e29dfdf7-596d-4a71-8612-ac2c5b18673f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_2dbc6685-5712-4f6d-9e61-27c4628ed5d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_41185e75-301a-4dc2-9934-9d1ba142ecc3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e29dfdf7-596d-4a71-8612-ac2c5b18673f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_41185e75-301a-4dc2-9934-9d1ba142ecc3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_12587834-f874-430a-bdc1-a2f1db438c95" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e29dfdf7-596d-4a71-8612-ac2c5b18673f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_12587834-f874-430a-bdc1-a2f1db438c95" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_60e97369-e3eb-463d-b9ed-3221a0f3e06b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e29dfdf7-596d-4a71-8612-ac2c5b18673f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_60e97369-e3eb-463d-b9ed-3221a0f3e06b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_c5f05da5-7da4-457d-b5b0-0111da557a2c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_1f511c3e-7298-442c-ba96-66d4da37deae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7899aca2-8a83-4444-b6dc-b8805b118a45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_1f511c3e-7298-442c-ba96-66d4da37deae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_b7fd95bf-b519-4047-822c-807c154f5743" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7899aca2-8a83-4444-b6dc-b8805b118a45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_b7fd95bf-b519-4047-822c-807c154f5743" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_a82a8963-44fc-43a7-82f7-830046f7c02d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_b7fd95bf-b519-4047-822c-807c154f5743" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_a82a8963-44fc-43a7-82f7-830046f7c02d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_06277bdb-7156-43ac-a67f-63c98f9652cd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_b7fd95bf-b519-4047-822c-807c154f5743" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_06277bdb-7156-43ac-a67f-63c98f9652cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_3658337a-8ac9-4491-8999-41b15cf0f34b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_b7fd95bf-b519-4047-822c-807c154f5743" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_3658337a-8ac9-4491-8999-41b15cf0f34b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_51e3b4c6-b725-4523-9f24-925ffad8bf15" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_b7fd95bf-b519-4047-822c-807c154f5743" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_51e3b4c6-b725-4523-9f24-925ffad8bf15" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_a2342c56-205c-417c-89e5-b272529bb0ed" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_b7fd95bf-b519-4047-822c-807c154f5743" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_a2342c56-205c-417c-89e5-b272529bb0ed" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3ef2ff4f-b826-4d70-a295-2ab0665b5d64" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_f36d7d2f-da91-48c5-a85e-ab14a1f27806" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7899aca2-8a83-4444-b6dc-b8805b118a45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_f36d7d2f-da91-48c5-a85e-ab14a1f27806" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_a6ebb4ee-60ed-4445-aaa2-2780939d86c4" xlink:href="tree-20220630.xsd#tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7899aca2-8a83-4444-b6dc-b8805b118a45" xlink:to="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_a6ebb4ee-60ed-4445-aaa2-2780939d86c4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_67a62fba-8be9-4560-9bfb-29cfc91787a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_a6ebb4ee-60ed-4445-aaa2-2780939d86c4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_67a62fba-8be9-4560-9bfb-29cfc91787a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_654efdf6-3f4a-4791-94fe-3b3d7748f381" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualTermAbstract_a6ebb4ee-60ed-4445-aaa2-2780939d86c4" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_654efdf6-3f4a-4791-94fe-3b3d7748f381" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract_b847c62f-04ce-4701-abb1-60fb7d32dcef" xlink:href="tree-20220630.xsd#tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7899aca2-8a83-4444-b6dc-b8805b118a45" xlink:to="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract_b847c62f-04ce-4701-abb1-60fb7d32dcef" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_0b6a1cef-41db-46b0-be77-fa4e7c419b9e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract_b847c62f-04ce-4701-abb1-60fb7d32dcef" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_0b6a1cef-41db-46b0-be77-fa4e7c419b9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_4a754035-a887-4e6f-b9c4-8b156355f559" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract_b847c62f-04ce-4701-abb1-60fb7d32dcef" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_4a754035-a887-4e6f-b9c4-8b156355f559" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_752d705c-a7e8-48d8-b1f6-36b2c821e095" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7899aca2-8a83-4444-b6dc-b8805b118a45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_752d705c-a7e8-48d8-b1f6-36b2c821e095" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_b830e234-218a-4d9f-a416-afce78a28e86" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_752d705c-a7e8-48d8-b1f6-36b2c821e095" xlink:to="loc_us-gaap_SharePrice_b830e234-218a-4d9f-a416-afce78a28e86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_17955bb6-adc4-4c40-8d8d-f8da06d87d34" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_752d705c-a7e8-48d8-b1f6-36b2c821e095" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_17955bb6-adc4-4c40-8d8d-f8da06d87d34" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_9e59d6ff-2dd2-4b7e-8cde-6c549322573e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_752d705c-a7e8-48d8-b1f6-36b2c821e095" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_9e59d6ff-2dd2-4b7e-8cde-6c549322573e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_d4746ab3-3bd4-48f4-ab97-1d0be3563b25" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_752d705c-a7e8-48d8-b1f6-36b2c821e095" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_d4746ab3-3bd4-48f4-ab97-1d0be3563b25" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_f6472521-5248-4174-a383-fad192fe7219" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_752d705c-a7e8-48d8-b1f6-36b2c821e095" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_f6472521-5248-4174-a383-fad192fe7219" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_6f965831-ba4a-443c-b08a-eac8bddb989a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_752d705c-a7e8-48d8-b1f6-36b2c821e095" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_6f965831-ba4a-443c-b08a-eac8bddb989a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_6abfb6d9-0e0f-4692-8aae-f373452c8d20" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_752d705c-a7e8-48d8-b1f6-36b2c821e095" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_6abfb6d9-0e0f-4692-8aae-f373452c8d20" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_74e6c0cd-8adc-4f66-85fa-c09410299dd3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_752d705c-a7e8-48d8-b1f6-36b2c821e095" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_74e6c0cd-8adc-4f66-85fa-c09410299dd3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_90d14f5a-2541-486d-9f43-b65af32c653f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_752d705c-a7e8-48d8-b1f6-36b2c821e095" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_90d14f5a-2541-486d-9f43-b65af32c653f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments_ee09e92c-29fc-46b1-aa05-a609b4a8faa1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_752d705c-a7e8-48d8-b1f6-36b2c821e095" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments_ee09e92c-29fc-46b1-aa05-a609b4a8faa1" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumSharesToBeEarned_368bcec7-0d40-4f77-8999-689ddd46d653" xlink:href="tree-20220630.xsd#tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumSharesToBeEarned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7899aca2-8a83-4444-b6dc-b8805b118a45" xlink:to="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumSharesToBeEarned_368bcec7-0d40-4f77-8999-689ddd46d653" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetNumberOfShares_404717d5-933f-4e44-b7cd-94a806df0a9c" xlink:href="tree-20220630.xsd#tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7899aca2-8a83-4444-b6dc-b8805b118a45" xlink:to="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetNumberOfShares_404717d5-933f-4e44-b7cd-94a806df0a9c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_PerformanceAwardsEarned_ebab8714-db3a-4bcc-9bde-3fb973021554" xlink:href="tree-20220630.xsd#tree_PerformanceAwardsEarned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7899aca2-8a83-4444-b6dc-b8805b118a45" xlink:to="loc_tree_PerformanceAwardsEarned_ebab8714-db3a-4bcc-9bde-3fb973021554" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_510da32b-cad8-4462-a527-06b58c2868fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7899aca2-8a83-4444-b6dc-b8805b118a45" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_510da32b-cad8-4462-a527-06b58c2868fb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_698975c9-d8f3-4740-9664-ffe594f4ca60" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_510da32b-cad8-4462-a527-06b58c2868fb" xlink:to="loc_us-gaap_AwardTypeAxis_698975c9-d8f3-4740-9664-ffe594f4ca60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_698975c9-d8f3-4740-9664-ffe594f4ca60_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_698975c9-d8f3-4740-9664-ffe594f4ca60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_698975c9-d8f3-4740-9664-ffe594f4ca60_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c4352d78-be59-44cf-80d0-56bc133e148f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_698975c9-d8f3-4740-9664-ffe594f4ca60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c4352d78-be59-44cf-80d0-56bc133e148f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_37d492cc-e121-43d8-b9a3-09269bd168b2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c4352d78-be59-44cf-80d0-56bc133e148f" xlink:to="loc_us-gaap_EmployeeStockOptionMember_37d492cc-e121-43d8-b9a3-09269bd168b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_PerformanceOptionsMember_b33b5302-1942-4b3c-b4b1-dfe3f49fcd63" xlink:href="tree-20220630.xsd#tree_PerformanceOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c4352d78-be59-44cf-80d0-56bc133e148f" xlink:to="loc_tree_PerformanceOptionsMember_b33b5302-1942-4b3c-b4b1-dfe3f49fcd63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_fe042888-1209-4050-932b-b1ca5df357e5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_510da32b-cad8-4462-a527-06b58c2868fb" xlink:to="loc_us-gaap_VestingAxis_fe042888-1209-4050-932b-b1ca5df357e5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_fe042888-1209-4050-932b-b1ca5df357e5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_fe042888-1209-4050-932b-b1ca5df357e5" xlink:to="loc_us-gaap_VestingDomain_fe042888-1209-4050-932b-b1ca5df357e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_ec4b2bb2-1808-4363-8baa-421e5c7fe5d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_fe042888-1209-4050-932b-b1ca5df357e5" xlink:to="loc_us-gaap_VestingDomain_ec4b2bb2-1808-4363-8baa-421e5c7fe5d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_fe8c3177-8ba2-48b3-9328-842f8381c9f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_ec4b2bb2-1808-4363-8baa-421e5c7fe5d0" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_fe8c3177-8ba2-48b3-9328-842f8381c9f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_98baf38a-b0be-4e35-8f58-f7296932f1d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_ec4b2bb2-1808-4363-8baa-421e5c7fe5d0" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_98baf38a-b0be-4e35-8f58-f7296932f1d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_23e7a35e-d92e-4bd6-a10e-8ff1d3785ec3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_510da32b-cad8-4462-a527-06b58c2868fb" xlink:to="loc_srt_RangeAxis_23e7a35e-d92e-4bd6-a10e-8ff1d3785ec3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_23e7a35e-d92e-4bd6-a10e-8ff1d3785ec3_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_23e7a35e-d92e-4bd6-a10e-8ff1d3785ec3" xlink:to="loc_srt_RangeMember_23e7a35e-d92e-4bd6-a10e-8ff1d3785ec3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_eb8b6aaf-e5f5-4b14-be8e-cd4391a12b3c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_23e7a35e-d92e-4bd6-a10e-8ff1d3785ec3" xlink:to="loc_srt_RangeMember_eb8b6aaf-e5f5-4b14-be8e-cd4391a12b3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_51fcec73-ae56-4588-82b6-b077d0f3eb53" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_eb8b6aaf-e5f5-4b14-be8e-cd4391a12b3c" xlink:to="loc_srt_MaximumMember_51fcec73-ae56-4588-82b6-b077d0f3eb53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_27c99d5f-80cf-48dd-8d18-32b10b533fba" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_eb8b6aaf-e5f5-4b14-be8e-cd4391a12b3c" xlink:to="loc_srt_MinimumMember_27c99d5f-80cf-48dd-8d18-32b10b533fba" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/STOCKBASEDCOMPENSATIONSummaryofRSARSUDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#STOCKBASEDCOMPENSATIONSummaryofRSARSUDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/STOCKBASEDCOMPENSATIONSummaryofRSARSUDetails" xlink:type="extended" id="i410b40fd80ce447fae2d94dcdbffc625_STOCKBASEDCOMPENSATIONSummaryofRSARSUDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_53716506-48d5-4466-bad4-1e28d7c03dc7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_5e3548ac-4e86-4503-a6db-d862232fe7ba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_53716506-48d5-4466-bad4-1e28d7c03dc7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_5e3548ac-4e86-4503-a6db-d862232fe7ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_bbf3493f-2750-4607-b94d-7dc49bbb39e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_5e3548ac-4e86-4503-a6db-d862232fe7ba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_bbf3493f-2750-4607-b94d-7dc49bbb39e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_d46a860d-9486-4ca0-932a-a26aeb162cad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_5e3548ac-4e86-4503-a6db-d862232fe7ba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_d46a860d-9486-4ca0-932a-a26aeb162cad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_2e32e105-2bee-4d39-b41c-820127bff6d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_5e3548ac-4e86-4503-a6db-d862232fe7ba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_2e32e105-2bee-4d39-b41c-820127bff6d0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_d6c7b2fb-3552-4659-8c1a-d83e30a32d6e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_5e3548ac-4e86-4503-a6db-d862232fe7ba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_d6c7b2fb-3552-4659-8c1a-d83e30a32d6e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_e7ed1988-6131-4c4e-8e54-77fef9413ad5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_862f7c9f-5b2d-44d2-8164-cbb96c43ccdb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_53716506-48d5-4466-bad4-1e28d7c03dc7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_862f7c9f-5b2d-44d2-8164-cbb96c43ccdb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9381adb0-d72c-4cfc-a776-6e5404185acc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_862f7c9f-5b2d-44d2-8164-cbb96c43ccdb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9381adb0-d72c-4cfc-a776-6e5404185acc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_fcb54cbd-ed52-4224-b2d4-acaee7013b95" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_862f7c9f-5b2d-44d2-8164-cbb96c43ccdb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_fcb54cbd-ed52-4224-b2d4-acaee7013b95" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_acbbe71d-6c5b-4097-b2cc-175fc8facfc4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_862f7c9f-5b2d-44d2-8164-cbb96c43ccdb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_acbbe71d-6c5b-4097-b2cc-175fc8facfc4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_43f1d19a-81ef-4c5c-9eea-cca3d693eb7c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_862f7c9f-5b2d-44d2-8164-cbb96c43ccdb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_43f1d19a-81ef-4c5c-9eea-cca3d693eb7c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_0a959bd8-ad8e-432b-be10-e19b657eaa95" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumSharesToBeEarned_eaebd921-b6ad-4c55-ba51-fa72137a8032" xlink:href="tree-20220630.xsd#tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumSharesToBeEarned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_53716506-48d5-4466-bad4-1e28d7c03dc7" xlink:to="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumSharesToBeEarned_eaebd921-b6ad-4c55-ba51-fa72137a8032" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetNumberOfShares_89aebaad-7d69-4e97-9a2d-c38b64ed1e2a" xlink:href="tree-20220630.xsd#tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_53716506-48d5-4466-bad4-1e28d7c03dc7" xlink:to="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetNumberOfShares_89aebaad-7d69-4e97-9a2d-c38b64ed1e2a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_PerformanceAwardsEarned_98db1333-3e2c-4a65-a3e0-ab0c97465503" xlink:href="tree-20220630.xsd#tree_PerformanceAwardsEarned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_53716506-48d5-4466-bad4-1e28d7c03dc7" xlink:to="loc_tree_PerformanceAwardsEarned_98db1333-3e2c-4a65-a3e0-ab0c97465503" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_603c9367-0125-4c58-a1d6-f73af7128f05" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_53716506-48d5-4466-bad4-1e28d7c03dc7" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_603c9367-0125-4c58-a1d6-f73af7128f05" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_164ea6b7-13a2-4554-8f91-7db84042c816" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_603c9367-0125-4c58-a1d6-f73af7128f05" xlink:to="loc_us-gaap_AwardTypeAxis_164ea6b7-13a2-4554-8f91-7db84042c816" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_164ea6b7-13a2-4554-8f91-7db84042c816_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_164ea6b7-13a2-4554-8f91-7db84042c816" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_164ea6b7-13a2-4554-8f91-7db84042c816_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_214060b4-4e47-4cd0-8f4f-ddb1879446c8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_164ea6b7-13a2-4554-8f91-7db84042c816" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_214060b4-4e47-4cd0-8f4f-ddb1879446c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_091d3316-f15d-4ce4-8fe5-1c618ebce754" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_214060b4-4e47-4cd0-8f4f-ddb1879446c8" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_091d3316-f15d-4ce4-8fe5-1c618ebce754" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_0e33a5f9-98d4-4b92-b0ca-1577e1acd2b5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_214060b4-4e47-4cd0-8f4f-ddb1879446c8" xlink:to="loc_us-gaap_PerformanceSharesMember_0e33a5f9-98d4-4b92-b0ca-1577e1acd2b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_MarketBasedRestrictedStockMember_33cbe03d-6e29-4365-9b31-4bcff637a676" xlink:href="tree-20220630.xsd#tree_MarketBasedRestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_214060b4-4e47-4cd0-8f4f-ddb1879446c8" xlink:to="loc_tree_MarketBasedRestrictedStockMember_33cbe03d-6e29-4365-9b31-4bcff637a676" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/STOCKBASEDCOMPENSATIONEmployeeStockPurchasePlanDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#STOCKBASEDCOMPENSATIONEmployeeStockPurchasePlanDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/STOCKBASEDCOMPENSATIONEmployeeStockPurchasePlanDetails" xlink:type="extended" id="id4a016dfd3da43a3878b4a15b36391a3_STOCKBASEDCOMPENSATIONEmployeeStockPurchasePlanDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_7b4291e1-f670-4497-aaa9-b00569331821" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_7b4291e1-f670-4497-aaa9-b00569331821" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_c16430de-d95b-48d9-b41c-4fd78938f2b7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_c16430de-d95b-48d9-b41c-4fd78938f2b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardConsecutiveOfferingPeriod_2ee8abc3-6e9c-4700-a104-61a6b9c91f90" xlink:href="tree-20220630.xsd#tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardConsecutiveOfferingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:to="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardConsecutiveOfferingPeriod_2ee8abc3-6e9c-4700-a104-61a6b9c91f90" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePeriod_61ab55dc-6518-4935-bc05-88d54d4a0288" xlink:href="tree-20220630.xsd#tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:to="loc_tree_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePeriod_61ab55dc-6518-4935-bc05-88d54d4a0288" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_574072f6-751d-4283-8dd0-2174c0968bb7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_574072f6-751d-4283-8dd0-2174c0968bb7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_81b271c6-b4d8-47ab-b908-6bbd9d53dba6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_81b271c6-b4d8-47ab-b908-6bbd9d53dba6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_42194841-d70d-40d2-8941-e82265e90a1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_42194841-d70d-40d2-8941-e82265e90a1b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_6f5fa298-0d57-4a46-abc0-8f73afba7c05" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_6f5fa298-0d57-4a46-abc0-8f73afba7c05" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_15e36df9-93f9-41d3-b610-f4ec7af4eaf1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_15e36df9-93f9-41d3-b610-f4ec7af4eaf1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_42b36b65-7882-4a6e-b7b3-2ac04e964d32" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_42b36b65-7882-4a6e-b7b3-2ac04e964d32" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments_cdb37a0c-626d-41c4-88bc-fd39c49b0355" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments_cdb37a0c-626d-41c4-88bc-fd39c49b0355" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_cc96fb79-e8d3-40b9-abfa-83deb4b9f2a7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89c84bcd-8806-4c8a-a542-41326a126f00" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_cc96fb79-e8d3-40b9-abfa-83deb4b9f2a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_8a7c45d3-0d7a-454a-85b8-c6b73dbd6846" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_cc96fb79-e8d3-40b9-abfa-83deb4b9f2a7" xlink:to="loc_us-gaap_AwardTypeAxis_8a7c45d3-0d7a-454a-85b8-c6b73dbd6846" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8a7c45d3-0d7a-454a-85b8-c6b73dbd6846_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_8a7c45d3-0d7a-454a-85b8-c6b73dbd6846" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8a7c45d3-0d7a-454a-85b8-c6b73dbd6846_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_81a8ab8c-7f21-4ea6-b9e5-e317beb31522" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_8a7c45d3-0d7a-454a-85b8-c6b73dbd6846" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_81a8ab8c-7f21-4ea6-b9e5-e317beb31522" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_985b5030-df68-4eba-b544-271ea02d9281" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_81a8ab8c-7f21-4ea6-b9e5-e317beb31522" xlink:to="loc_us-gaap_EmployeeStockMember_985b5030-df68-4eba-b544-271ea02d9281" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/DEBTConvertibleSeniorNotesNarrativeDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#DEBTConvertibleSeniorNotesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/DEBTConvertibleSeniorNotesNarrativeDetails" xlink:type="extended" id="i2fe068b551174009b09e34fc95cfe463_DEBTConvertibleSeniorNotesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_a3f7552a-602c-4e4d-a908-6928c169f719" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_a3f7552a-602c-4e4d-a908-6928c169f719" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ba79edb6-d058-4aec-ab1c-773918e065c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ba79edb6-d058-4aec-ab1c-773918e065c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_DebtConversionNumberofSharesofCommonStockConvertibleper1000ofPrincipalNotes_8103ff71-4bab-4c41-bbf4-56e9e25b091a" xlink:href="tree-20220630.xsd#tree_DebtConversionNumberofSharesofCommonStockConvertibleper1000ofPrincipalNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_tree_DebtConversionNumberofSharesofCommonStockConvertibleper1000ofPrincipalNotes_8103ff71-4bab-4c41-bbf4-56e9e25b091a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_ab584e4c-10f9-4235-8cd1-694df0161f6d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_ab584e4c-10f9-4235-8cd1-694df0161f6d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_53ea7201-3c4f-4041-8a69-54005861af57" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentConvertibleThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_53ea7201-3c4f-4041-8a69-54005861af57" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_f179952b-62a0-45a9-9b20-dd0a3ad85716" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1_f179952b-62a0-45a9-9b20-dd0a3ad85716" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_dc8de1c6-15a0-4193-9ea0-1ad84a3cf0b7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_dc8de1c6-15a0-4193-9ea0-1ad84a3cf0b7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTriggerFiveBusinessDays_31b0747c-90aa-4d69-9a00-ca2e5642c437" xlink:href="tree-20220630.xsd#tree_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTriggerFiveBusinessDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_tree_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTriggerFiveBusinessDays_31b0747c-90aa-4d69-9a00-ca2e5642c437" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_ca244d84-0429-45af-b84d-2a184dd4e2cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_ca244d84-0429-45af-b84d-2a184dd4e2cc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_NonconvertibleDebtBorrowingRateattheDateofIssuance_d3d1178d-8848-4334-9e79-a9e9fd03556c" xlink:href="tree-20220630.xsd#tree_NonconvertibleDebtBorrowingRateattheDateofIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_tree_NonconvertibleDebtBorrowingRateattheDateofIssuance_d3d1178d-8848-4334-9e79-a9e9fd03556c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtNoncurrent_c1d8cd4d-959a-4e67-9909-8298b465778f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConvertibleDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_ConvertibleDebtNoncurrent_c1d8cd4d-959a-4e67-9909-8298b465778f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent_dbc965a3-1eec-4917-bb70-fae8a1ab5a73" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent_dbc965a3-1eec-4917-bb70-fae8a1ab5a73" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_71758a1d-c8ff-4050-a780-63d1b8904b90" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_71758a1d-c8ff-4050-a780-63d1b8904b90" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_Debtissuancecostsliabilitycomponent_b4ef0f20-0319-4ef3-8e23-289da6e433bd" xlink:href="tree-20220630.xsd#tree_Debtissuancecostsliabilitycomponent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_tree_Debtissuancecostsliabilitycomponent_b4ef0f20-0319-4ef3-8e23-289da6e433bd" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_Debtissuancecostsequitycomponent_c345e103-781b-40a6-9b92-119eaec0a5eb" xlink:href="tree-20220630.xsd#tree_Debtissuancecostsequitycomponent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_tree_Debtissuancecostsequitycomponent_c345e103-781b-40a6-9b92-119eaec0a5eb" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_13150ba3-e968-4219-aa19-94b074c5d9ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_InterestExpenseDebt_13150ba3-e968-4219-aa19-94b074c5d9ae" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_0f8d71a3-bb72-4071-bc75-8355fc1f3805" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestExpenseDebtExcludingAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_0f8d71a3-bb72-4071-bc75-8355fc1f3805" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_b8f710ed-587d-494b-8376-aa6b85f7f7be" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_b8f710ed-587d-494b-8376-aa6b85f7f7be" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_9a61949a-8160-434a-a35e-cf0082c055ff" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_9a61949a-8160-434a-a35e-cf0082c055ff" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_cda82917-a624-48f1-b7b7-73a884505c66" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfDebtDiscountPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_AmortizationOfDebtDiscountPremium_cda82917-a624-48f1-b7b7-73a884505c66" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_b94d7715-be69-4083-ac82-29618c15e566" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_LongTermDebtFairValue_b94d7715-be69-4083-ac82-29618c15e566" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfConvertibleDebt_7f4c7af3-931c-4e6c-8c3d-cca038ccc74a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_RepaymentsOfConvertibleDebt_7f4c7af3-931c-4e6c-8c3d-cca038ccc74a" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_399a733a-0513-46e0-a405-d2d938dcaaaa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_399a733a-0513-46e0-a405-d2d938dcaaaa" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_DebtInstrumentRepurchasedAmountAccruedInterest_688f0890-2ca7-4fee-9257-afbd8658a25e" xlink:href="tree-20220630.xsd#tree_DebtInstrumentRepurchasedAmountAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_tree_DebtInstrumentRepurchasedAmountAccruedInterest_688f0890-2ca7-4fee-9257-afbd8658a25e" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount_7de04429-a6e6-40e8-9b9f-1528615af773" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ExtinguishmentOfDebtAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_ExtinguishmentOfDebtAmount_7de04429-a6e6-40e8-9b9f-1528615af773" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_AdjustmentstoAdditionalPaidinCapitalRepurchaseofConvertibleDebt_cc59466b-90b3-4426-b3b5-332ed6e0784e" xlink:href="tree-20220630.xsd#tree_AdjustmentstoAdditionalPaidinCapitalRepurchaseofConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_tree_AdjustmentstoAdditionalPaidinCapitalRepurchaseofConvertibleDebt_cc59466b-90b3-4426-b3b5-332ed6e0784e" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_58c25dbc-3adb-4c6d-b050-73208d5c1c96" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_58c25dbc-3adb-4c6d-b050-73208d5c1c96" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_b791892f-7c05-4291-9470-ca5258bb4929" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_732dd8a9-9250-4485-9d67-a491583014fa" xlink:to="loc_us-gaap_DebtInstrumentTable_b791892f-7c05-4291-9470-ca5258bb4929" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_b3083c55-23d7-41c9-9941-6ae55a00f8c4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b791892f-7c05-4291-9470-ca5258bb4929" xlink:to="loc_us-gaap_DebtInstrumentAxis_b3083c55-23d7-41c9-9941-6ae55a00f8c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b3083c55-23d7-41c9-9941-6ae55a00f8c4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_b3083c55-23d7-41c9-9941-6ae55a00f8c4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b3083c55-23d7-41c9-9941-6ae55a00f8c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_ec23806d-d054-4d5e-a4a8-914b5e2e2e56" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_b3083c55-23d7-41c9-9941-6ae55a00f8c4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_ec23806d-d054-4d5e-a4a8-914b5e2e2e56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_A2025ConvertibleNotesMember_11f2999f-c7ea-4bd6-87fa-fa5cfca4c896" xlink:href="tree-20220630.xsd#tree_A2025ConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ec23806d-d054-4d5e-a4a8-914b5e2e2e56" xlink:to="loc_tree_A2025ConvertibleNotesMember_11f2999f-c7ea-4bd6-87fa-fa5cfca4c896" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_A2025NotesUnder13dayPurchaseOptionMember_1210cfcf-a6fc-4e16-86b5-72e2949fc210" xlink:href="tree-20220630.xsd#tree_A2025NotesUnder13dayPurchaseOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_tree_A2025ConvertibleNotesMember_11f2999f-c7ea-4bd6-87fa-fa5cfca4c896" xlink:to="loc_tree_A2025NotesUnder13dayPurchaseOptionMember_1210cfcf-a6fc-4e16-86b5-72e2949fc210" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_A2022ConvertibleNotesMember_14370642-dbf1-45a4-a319-7221e94ad7cd" xlink:href="tree-20220630.xsd#tree_A2022ConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ec23806d-d054-4d5e-a4a8-914b5e2e2e56" xlink:to="loc_tree_A2022ConvertibleNotesMember_14370642-dbf1-45a4-a319-7221e94ad7cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_802d2bd9-1fb8-4559-824d-a78dd0b35003" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b791892f-7c05-4291-9470-ca5258bb4929" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_802d2bd9-1fb8-4559-824d-a78dd0b35003" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_802d2bd9-1fb8-4559-824d-a78dd0b35003_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_802d2bd9-1fb8-4559-824d-a78dd0b35003" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_802d2bd9-1fb8-4559-824d-a78dd0b35003_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_2cd1b16f-0d71-4b7c-8140-2c9d73e6dbfd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_802d2bd9-1fb8-4559-824d-a78dd0b35003" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_2cd1b16f-0d71-4b7c-8140-2c9d73e6dbfd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_efa02260-0537-4932-bdbc-509e2bbccb53" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_2cd1b16f-0d71-4b7c-8140-2c9d73e6dbfd" xlink:to="loc_us-gaap_ConvertibleDebtMember_efa02260-0537-4932-bdbc-509e2bbccb53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_c90ddd17-6328-4fe5-9885-ee9739ead93b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b791892f-7c05-4291-9470-ca5258bb4929" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_c90ddd17-6328-4fe5-9885-ee9739ead93b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_c90ddd17-6328-4fe5-9885-ee9739ead93b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_c90ddd17-6328-4fe5-9885-ee9739ead93b" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_c90ddd17-6328-4fe5-9885-ee9739ead93b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_08decf79-c200-4aa3-ac83-d24f1356e9eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_c90ddd17-6328-4fe5-9885-ee9739ead93b" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_08decf79-c200-4aa3-ac83-d24f1356e9eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_0c09c6fa-35dc-43fd-b202-345531b460b2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_08decf79-c200-4aa3-ac83-d24f1356e9eb" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_0c09c6fa-35dc-43fd-b202-345531b460b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_6f0df1c9-d1a7-4d4b-aba5-e2cdc56d66f9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentRedemptionPeriodTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_08decf79-c200-4aa3-ac83-d24f1356e9eb" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_6f0df1c9-d1a7-4d4b-aba5-e2cdc56d66f9" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/DEBTComponentsofNotesDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#DEBTComponentsofNotesDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/DEBTComponentsofNotesDetails" xlink:type="extended" id="i494351c8d1384605acebd4c9326c8050_DEBTComponentsofNotesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_13f049ca-afb1-4abb-9c0a-4d83f5d8dabb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebt_95b8b390-1dfa-418f-92ee-0e83707ea2da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_13f049ca-afb1-4abb-9c0a-4d83f5d8dabb" xlink:to="loc_us-gaap_ConvertibleDebt_95b8b390-1dfa-418f-92ee-0e83707ea2da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_a0a81b29-bdf5-4cca-bbaf-767b43297f5d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_13f049ca-afb1-4abb-9c0a-4d83f5d8dabb" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_a0a81b29-bdf5-4cca-bbaf-767b43297f5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_Debtissuancecostsliabilitycomponent_dc6f632d-fb78-45a9-b579-7b1ed422986f" xlink:href="tree-20220630.xsd#tree_Debtissuancecostsliabilitycomponent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_13f049ca-afb1-4abb-9c0a-4d83f5d8dabb" xlink:to="loc_tree_Debtissuancecostsliabilitycomponent_dc6f632d-fb78-45a9-b579-7b1ed422986f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_56139ae8-7765-4a4c-b5b3-ba24ffae7671" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_13f049ca-afb1-4abb-9c0a-4d83f5d8dabb" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_56139ae8-7765-4a4c-b5b3-ba24ffae7671" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_8eacf956-477e-470e-9660-45ed5dd55dc2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_13f049ca-afb1-4abb-9c0a-4d83f5d8dabb" xlink:to="loc_us-gaap_DebtInstrumentTable_8eacf956-477e-470e-9660-45ed5dd55dc2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_1a498385-53eb-4535-8956-846b792b2992" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8eacf956-477e-470e-9660-45ed5dd55dc2" xlink:to="loc_us-gaap_DebtInstrumentAxis_1a498385-53eb-4535-8956-846b792b2992" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1a498385-53eb-4535-8956-846b792b2992_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_1a498385-53eb-4535-8956-846b792b2992" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1a498385-53eb-4535-8956-846b792b2992_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f6e6847c-cd01-49cd-b0a2-e61e82fb81f7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_1a498385-53eb-4535-8956-846b792b2992" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f6e6847c-cd01-49cd-b0a2-e61e82fb81f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_A2025ConvertibleNotesMember_8bd27cae-bda8-4c32-9356-1e3dea7d6f6d" xlink:href="tree-20220630.xsd#tree_A2025ConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f6e6847c-cd01-49cd-b0a2-e61e82fb81f7" xlink:to="loc_tree_A2025ConvertibleNotesMember_8bd27cae-bda8-4c32-9356-1e3dea7d6f6d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_A2022ConvertibleNotesMember_553dba54-c4d4-4baa-9a29-6b7e48152629" xlink:href="tree-20220630.xsd#tree_A2022ConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f6e6847c-cd01-49cd-b0a2-e61e82fb81f7" xlink:to="loc_tree_A2022ConvertibleNotesMember_553dba54-c4d4-4baa-9a29-6b7e48152629" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/DEBTConvertibleNoteHedgeandWarrantTransactionsDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#DEBTConvertibleNoteHedgeandWarrantTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/DEBTConvertibleNoteHedgeandWarrantTransactionsDetails" xlink:type="extended" id="id932e44061f54091bf7ddc83c1b5488c_DEBTConvertibleNoteHedgeandWarrantTransactionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_NetproceedsfromtheConvertibleNotesusedtopayforthecostoftheConvertibleNoteHedge_149df9a5-5a33-40ee-b470-c523a72873f0" xlink:href="tree-20220630.xsd#tree_NetproceedsfromtheConvertibleNotesusedtopayforthecostoftheConvertibleNoteHedge"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_tree_NetproceedsfromtheConvertibleNotesusedtopayforthecostoftheConvertibleNoteHedge_149df9a5-5a33-40ee-b470-c523a72873f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForHedgeFinancingActivities_60ab5af0-a778-45fd-9476-3104e96d3d3b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForHedgeFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_us-gaap_PaymentsForHedgeFinancingActivities_60ab5af0-a778-45fd-9476-3104e96d3d3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_NumberofSharesCoveredbytheHedgeTransactions_05986e3c-ade4-42c2-8744-931563d1d999" xlink:href="tree-20220630.xsd#tree_NumberofSharesCoveredbytheHedgeTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_tree_NumberofSharesCoveredbytheHedgeTransactions_05986e3c-ade4-42c2-8744-931563d1d999" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_e28a5cba-ac64-4347-a936-3217ddb9cbd2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_e28a5cba-ac64-4347-a936-3217ddb9cbd2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_91f6f446-dbba-4891-a7c9-cf4cb8a18b07" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_91f6f446-dbba-4891-a7c9-cf4cb8a18b07" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_Premiumofwarrantstrikepriceoversalespriceofcommonstock_b6b63c48-8da1-4980-a7b4-fe7f78ec78f8" xlink:href="tree-20220630.xsd#tree_Premiumofwarrantstrikepriceoversalespriceofcommonstock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_tree_Premiumofwarrantstrikepriceoversalespriceofcommonstock_b6b63c48-8da1-4980-a7b4-fe7f78ec78f8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_1eed2b17-aee8-4079-94f4-22422a5c8ae1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_us-gaap_SharePrice_1eed2b17-aee8-4079-94f4-22422a5c8ae1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfWarrants_3add54a9-eb4a-4864-8b55-8b6d3d9046bd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfWarrants_3add54a9-eb4a-4864-8b55-8b6d3d9046bd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_1c30fe72-0cdf-4026-85f7-b16a249203dd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_1c30fe72-0cdf-4026-85f7-b16a249203dd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromHedgeFinancingActivities_adb904b1-d774-4489-b6b9-da1d27c5208f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromHedgeFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_us-gaap_ProceedsFromHedgeFinancingActivities_adb904b1-d774-4489-b6b9-da1d27c5208f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfWarrants_09b29a45-0c28-4b1b-9377-448804aa1658" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForRepurchaseOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfWarrants_09b29a45-0c28-4b1b-9377-448804aa1658" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ProceedsfromHedgeandWarrants_b405a341-76a6-4252-8f01-1e677570e230" xlink:href="tree-20220630.xsd#tree_ProceedsfromHedgeandWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_tree_ProceedsfromHedgeandWarrants_b405a341-76a6-4252-8f01-1e677570e230" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_3dca82b1-4d2f-4cc9-a9c7-0f731627adf1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0478d285-f655-4c4b-aa7a-4802fe805847" xlink:to="loc_us-gaap_DebtInstrumentTable_3dca82b1-4d2f-4cc9-a9c7-0f731627adf1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_b8953288-0cf3-43a4-a970-b630f082f0b2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3dca82b1-4d2f-4cc9-a9c7-0f731627adf1" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_b8953288-0cf3-43a4-a970-b630f082f0b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_b8953288-0cf3-43a4-a970-b630f082f0b2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_b8953288-0cf3-43a4-a970-b630f082f0b2" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_b8953288-0cf3-43a4-a970-b630f082f0b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_565a2b05-79c3-4bae-aa72-80536cfd8711" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_b8953288-0cf3-43a4-a970-b630f082f0b2" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_565a2b05-79c3-4bae-aa72-80536cfd8711" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_A2020WarrantsMember_6218ba32-918f-4a00-bd88-73996d969b8a" xlink:href="tree-20220630.xsd#tree_A2020WarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_565a2b05-79c3-4bae-aa72-80536cfd8711" xlink:to="loc_tree_A2020WarrantsMember_6218ba32-918f-4a00-bd88-73996d969b8a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_A2017WarrantsMember_6d3ee270-f093-4fe4-92ed-514d60324ae2" xlink:href="tree-20220630.xsd#tree_A2017WarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_565a2b05-79c3-4bae-aa72-80536cfd8711" xlink:to="loc_tree_A2017WarrantsMember_6d3ee270-f093-4fe4-92ed-514d60324ae2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/DEBTCreditFacilityDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#DEBTCreditFacilityDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/DEBTCreditFacilityDetails" xlink:type="extended" id="i784b1a611fc646c49fc866378eab92b4_DEBTCreditFacilityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_b26212ab-32e5-4cc8-8e98-444fb07a9a74" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_b26212ab-32e5-4cc8-8e98-444fb07a9a74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSecuredDebt_4944cf2f-1327-4b98-96c3-9a67ffba547b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfSecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSecuredDebt_4944cf2f-1327-4b98-96c3-9a67ffba547b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_RepaymentsOfConvertibleDebtIncludingInterest_6d92d59e-9995-4381-9416-d634eed26555" xlink:href="tree-20220630.xsd#tree_RepaymentsOfConvertibleDebtIncludingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_RepaymentsOfConvertibleDebtIncludingInterest_6d92d59e-9995-4381-9416-d634eed26555" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_LineOfCreditFacilityCapacityAvailableForGeneralCorporatePurchases_50f5f1fa-df15-4978-8ad5-1b542735eff7" xlink:href="tree-20220630.xsd#tree_LineOfCreditFacilityCapacityAvailableForGeneralCorporatePurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_LineOfCreditFacilityCapacityAvailableForGeneralCorporatePurchases_50f5f1fa-df15-4978-8ad5-1b542735eff7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_e5d7888d-09ba-46e7-9aac-7b5ea8bfe2a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_DebtInstrumentTerm_e5d7888d-09ba-46e7-9aac-7b5ea8bfe2a6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_c1b34957-90ce-4d88-a5f2-a3d33dc2fc57" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_LineOfCredit_c1b34957-90ce-4d88-a5f2-a3d33dc2fc57" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a466963c-6a4b-4ce6-a71f-65aad79e44f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a466963c-6a4b-4ce6-a71f-65aad79e44f1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_0adb8851-4f1d-41cf-82e6-fffb8b9e9abd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_LongTermDebtCurrent_0adb8851-4f1d-41cf-82e6-fffb8b9e9abd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_CreditAgreementPotentialAdditionalBorrowingCapacity_9c2a4ace-d87b-46cc-8d23-5ecaaa18adc1" xlink:href="tree-20220630.xsd#tree_CreditAgreementPotentialAdditionalBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_CreditAgreementPotentialAdditionalBorrowingCapacity_9c2a4ace-d87b-46cc-8d23-5ecaaa18adc1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_CreditAgreementRatioofDebttoEBITDA_81801692-8eac-4342-b0fd-27e48c076ce7" xlink:href="tree-20220630.xsd#tree_CreditAgreementRatioofDebttoEBITDA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_CreditAgreementRatioofDebttoEBITDA_81801692-8eac-4342-b0fd-27e48c076ce7" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_87a1b20e-3ea8-4412-9b14-5e7b4010d782" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_87a1b20e-3ea8-4412-9b14-5e7b4010d782" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_CreditFacilityRestrictiveFinancialCovenantFirstLienNetLeverageRatio_b586f4a5-9c70-44a7-8964-707b4b6082fd" xlink:href="tree-20220630.xsd#tree_CreditFacilityRestrictiveFinancialCovenantFirstLienNetLeverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_CreditFacilityRestrictiveFinancialCovenantFirstLienNetLeverageRatio_b586f4a5-9c70-44a7-8964-707b4b6082fd" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_CreditFacilityRestrictiveFinancialCovenantFirstLienNetLeverageRatioIncrease_94948aa2-eccd-474d-8448-0bdd6f2103b4" xlink:href="tree-20220630.xsd#tree_CreditFacilityRestrictiveFinancialCovenantFirstLienNetLeverageRatioIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_CreditFacilityRestrictiveFinancialCovenantFirstLienNetLeverageRatioIncrease_94948aa2-eccd-474d-8448-0bdd6f2103b4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_DebtInstrumentCovenantBorrowingCapacityThreshold_7315cc94-cacd-4402-9a4f-2936383f8cd9" xlink:href="tree-20220630.xsd#tree_DebtInstrumentCovenantBorrowingCapacityThreshold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_DebtInstrumentCovenantBorrowingCapacityThreshold_7315cc94-cacd-4402-9a4f-2936383f8cd9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_CreditFacilityRestrictivePaymentCovenantTotalNetLeverageRatio_2f6dc124-f03d-4463-a2b8-43636a7ecea0" xlink:href="tree-20220630.xsd#tree_CreditFacilityRestrictivePaymentCovenantTotalNetLeverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_CreditFacilityRestrictivePaymentCovenantTotalNetLeverageRatio_2f6dc124-f03d-4463-a2b8-43636a7ecea0" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_DebtInstrumentRedemptionPricePremiumPercentage_2c0c8c65-1031-4462-a7af-15bb0f19bc87" xlink:href="tree-20220630.xsd#tree_DebtInstrumentRedemptionPricePremiumPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_DebtInstrumentRedemptionPricePremiumPercentage_2c0c8c65-1031-4462-a7af-15bb0f19bc87" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_DebtInstrumentRedemptionPricePremiumPercentagePeriod_f1f0c339-0ece-4287-a5a6-7b2df14e9eda" xlink:href="tree-20220630.xsd#tree_DebtInstrumentRedemptionPricePremiumPercentagePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_DebtInstrumentRedemptionPricePremiumPercentagePeriod_f1f0c339-0ece-4287-a5a6-7b2df14e9eda" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_LineofCreditFacilityCollateralPercentofDomesticSubsidiariesEquity_5b1c4bf1-dd72-45ee-b3d6-49c7bc58e63a" xlink:href="tree-20220630.xsd#tree_LineofCreditFacilityCollateralPercentofDomesticSubsidiariesEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_LineofCreditFacilityCollateralPercentofDomesticSubsidiariesEquity_5b1c4bf1-dd72-45ee-b3d6-49c7bc58e63a" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_LineofCreditFacilityCollateralPercentofVotingEquity_5bc6f750-60a8-41f2-a395-250b24e3e29b" xlink:href="tree-20220630.xsd#tree_LineofCreditFacilityCollateralPercentofVotingEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_LineofCreditFacilityCollateralPercentofVotingEquity_5bc6f750-60a8-41f2-a395-250b24e3e29b" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_LineofCreditFacilityCollateralPercentofNonVotingEquity_220028c4-26fd-4389-9a7a-67903d15ba19" xlink:href="tree-20220630.xsd#tree_LineofCreditFacilityCollateralPercentofNonVotingEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_LineofCreditFacilityCollateralPercentofNonVotingEquity_220028c4-26fd-4389-9a7a-67903d15ba19" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_59e34b49-342d-42b3-8b35-ded60d4293e8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_59e34b49-342d-42b3-8b35-ded60d4293e8" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_LineofCreditFacilityLetterofCreditParticipationFeePercentage_322154f3-9d85-4bf1-ac59-f232e57399db" xlink:href="tree-20220630.xsd#tree_LineofCreditFacilityLetterofCreditParticipationFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_LineofCreditFacilityLetterofCreditParticipationFeePercentage_322154f3-9d85-4bf1-ac59-f232e57399db" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_LineofCreditFacilityLetterofCreditFrontingFeePercentage_11c3711f-0226-4b03-9da3-cfcf8bc21d8a" xlink:href="tree-20220630.xsd#tree_LineofCreditFacilityLetterofCreditFrontingFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_tree_LineofCreditFacilityLetterofCreditFrontingFeePercentage_11c3711f-0226-4b03-9da3-cfcf8bc21d8a" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_ec816190-e31a-48e7-bf10-c6b383416510" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_ec816190-e31a-48e7-bf10-c6b383416510" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFeeAmount_2d6e5f6b-78a2-4376-ba93-88f3f6303fec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFeeAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_DebtInstrumentFeeAmount_2d6e5f6b-78a2-4376-ba93-88f3f6303fec" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_e0ef5029-14a8-475a-8cbb-a537984a64ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_e0ef5029-14a8-475a-8cbb-a537984a64ac" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_8172a8b8-5e88-48dd-a553-e77356766c6f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_InterestExpenseDebt_8172a8b8-5e88-48dd-a553-e77356766c6f" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityFee_77b84bc7-eb86-43a3-9a5f-0d50de7c3105" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityFee_77b84bc7-eb86-43a3-9a5f-0d50de7c3105" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_1b2268b6-c5d8-4ff8-8374-c537a51b4d79" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_1b2268b6-c5d8-4ff8-8374-c537a51b4d79" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_61ff3f89-20f6-4aff-a240-47dab8b3b31f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestExpenseDebtExcludingAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_61ff3f89-20f6-4aff-a240-47dab8b3b31f" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_2325fc19-52e0-4cf8-8b06-5a5e9b0afcfc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfDebtDiscountPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_AmortizationOfDebtDiscountPremium_2325fc19-52e0-4cf8-8b06-5a5e9b0afcfc" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_f8bc6440-f4bb-4427-97f9-0ff453d3adfc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_e1073d36-a030-45ae-92a8-94886dbc8205" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_f8bc6440-f4bb-4427-97f9-0ff453d3adfc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_731864a2-1f3e-40eb-9224-cb320318c7e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f8bc6440-f4bb-4427-97f9-0ff453d3adfc" xlink:to="loc_us-gaap_DebtInstrumentAxis_731864a2-1f3e-40eb-9224-cb320318c7e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_731864a2-1f3e-40eb-9224-cb320318c7e6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_731864a2-1f3e-40eb-9224-cb320318c7e6" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_731864a2-1f3e-40eb-9224-cb320318c7e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_00ea14fc-3e16-41dc-a903-c28105e332a9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_731864a2-1f3e-40eb-9224-cb320318c7e6" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_00ea14fc-3e16-41dc-a903-c28105e332a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_30dda2dd-dded-435a-abf1-ca156a016ce4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_00ea14fc-3e16-41dc-a903-c28105e332a9" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_30dda2dd-dded-435a-abf1-ca156a016ce4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_CreditAgreementMember_efaabcc5-e93c-4d44-a9b8-cc802699463b" xlink:href="tree-20220630.xsd#tree_CreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_00ea14fc-3e16-41dc-a903-c28105e332a9" xlink:to="loc_tree_CreditAgreementMember_efaabcc5-e93c-4d44-a9b8-cc802699463b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_A2022ConvertibleNotesMember_18280fdf-37ef-457f-8a9d-b2537c179678" xlink:href="tree-20220630.xsd#tree_A2022ConvertibleNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_00ea14fc-3e16-41dc-a903-c28105e332a9" xlink:to="loc_tree_A2022ConvertibleNotesMember_18280fdf-37ef-457f-8a9d-b2537c179678" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_AmendedRevolvingCreditFacilityMember_d6baf4f6-67ee-4c0a-a195-c059e19e817c" xlink:href="tree-20220630.xsd#tree_AmendedRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_00ea14fc-3e16-41dc-a903-c28105e332a9" xlink:to="loc_tree_AmendedRevolvingCreditFacilityMember_d6baf4f6-67ee-4c0a-a195-c059e19e817c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_10d69d29-0d61-4cf8-a21e-d3eb8ad336be" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f8bc6440-f4bb-4427-97f9-0ff453d3adfc" xlink:to="loc_srt_RangeAxis_10d69d29-0d61-4cf8-a21e-d3eb8ad336be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_10d69d29-0d61-4cf8-a21e-d3eb8ad336be_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_10d69d29-0d61-4cf8-a21e-d3eb8ad336be" xlink:to="loc_srt_RangeMember_10d69d29-0d61-4cf8-a21e-d3eb8ad336be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0791bffb-a148-4ec3-9586-5f038252b5d8" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_10d69d29-0d61-4cf8-a21e-d3eb8ad336be" xlink:to="loc_srt_RangeMember_0791bffb-a148-4ec3-9586-5f038252b5d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_2c72c7bc-a664-42d8-91fc-18080591e494" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_0791bffb-a148-4ec3-9586-5f038252b5d8" xlink:to="loc_srt_MinimumMember_2c72c7bc-a664-42d8-91fc-18080591e494" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_6639f049-fa01-422c-b5ed-09066ac78732" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_0791bffb-a148-4ec3-9586-5f038252b5d8" xlink:to="loc_srt_MaximumMember_6639f049-fa01-422c-b5ed-09066ac78732" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_5b263b34-4fc6-45db-b9bb-52b17553e0dd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f8bc6440-f4bb-4427-97f9-0ff453d3adfc" xlink:to="loc_us-gaap_VariableRateAxis_5b263b34-4fc6-45db-b9bb-52b17553e0dd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_5b263b34-4fc6-45db-b9bb-52b17553e0dd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_5b263b34-4fc6-45db-b9bb-52b17553e0dd" xlink:to="loc_us-gaap_VariableRateDomain_5b263b34-4fc6-45db-b9bb-52b17553e0dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_6398d639-61f5-48b0-9057-404d04c78f78" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_5b263b34-4fc6-45db-b9bb-52b17553e0dd" xlink:to="loc_us-gaap_VariableRateDomain_6398d639-61f5-48b0-9057-404d04c78f78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_6b529680-6191-4018-a874-1c0dc6fde735" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FederalFundsEffectiveSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_6398d639-61f5-48b0-9057-404d04c78f78" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_6b529680-6191-4018-a874-1c0dc6fde735" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_5c449978-3d84-48a5-95f2-1e3d5c4e48e3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_6398d639-61f5-48b0-9057-404d04c78f78" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_5c449978-3d84-48a5-95f2-1e3d5c4e48e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_49cd1a18-5f2e-4146-81a0-f60a28733998" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_6398d639-61f5-48b0-9057-404d04c78f78" xlink:to="loc_us-gaap_BaseRateMember_49cd1a18-5f2e-4146-81a0-f60a28733998" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_4fd6f238-edfd-4c90-9542-863252285bec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f8bc6440-f4bb-4427-97f9-0ff453d3adfc" xlink:to="loc_us-gaap_CreditFacilityAxis_4fd6f238-edfd-4c90-9542-863252285bec" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_4fd6f238-edfd-4c90-9542-863252285bec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_4fd6f238-edfd-4c90-9542-863252285bec" xlink:to="loc_us-gaap_CreditFacilityDomain_4fd6f238-edfd-4c90-9542-863252285bec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_ab28cf94-f23f-4446-ba18-2d5a4ae83d9b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_4fd6f238-edfd-4c90-9542-863252285bec" xlink:to="loc_us-gaap_CreditFacilityDomain_ab28cf94-f23f-4446-ba18-2d5a4ae83d9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_90cab7e4-89c0-407c-a7ef-c831e59a6f1e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ab28cf94-f23f-4446-ba18-2d5a4ae83d9b" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_90cab7e4-89c0-407c-a7ef-c831e59a6f1e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_DelayedDrawTermLoanMember_18814585-1352-4ebd-a11f-98db0ca2cdcf" xlink:href="tree-20220630.xsd#tree_DelayedDrawTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ab28cf94-f23f-4446-ba18-2d5a4ae83d9b" xlink:to="loc_tree_DelayedDrawTermLoanMember_18814585-1352-4ebd-a11f-98db0ca2cdcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_6d2f99e0-e66b-480b-a50c-c29265d8e8d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ab28cf94-f23f-4446-ba18-2d5a4ae83d9b" xlink:to="loc_us-gaap_LetterOfCreditMember_6d2f99e0-e66b-480b-a50c-c29265d8e8d6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_83975f38-91f2-4b01-9c59-72526faf56e7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f8bc6440-f4bb-4427-97f9-0ff453d3adfc" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_83975f38-91f2-4b01-9c59-72526faf56e7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_83975f38-91f2-4b01-9c59-72526faf56e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_83975f38-91f2-4b01-9c59-72526faf56e7" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_83975f38-91f2-4b01-9c59-72526faf56e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4a730565-130d-4fb6-bb6d-fc99e8db5c68" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_83975f38-91f2-4b01-9c59-72526faf56e7" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4a730565-130d-4fb6-bb6d-fc99e8db5c68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_f4fee40c-08cc-4eb8-a2fc-58019a561496" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4a730565-130d-4fb6-bb6d-fc99e8db5c68" xlink:to="loc_us-gaap_LineOfCreditMember_f4fee40c-08cc-4eb8-a2fc-58019a561496" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/FAIRVALUEMEASUREMENTSDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#FAIRVALUEMEASUREMENTSDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/FAIRVALUEMEASUREMENTSDetails" xlink:type="extended" id="i20349bce563741fdb2b6484d620e4976_FAIRVALUEMEASUREMENTSDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_033f8a6b-cc10-4b7f-a49c-0766b6822e60" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_a54bcd64-971c-4a6f-a59f-c7150f24ace3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_033f8a6b-cc10-4b7f-a49c-0766b6822e60" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_a54bcd64-971c-4a6f-a59f-c7150f24ace3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ContingentConsiderationPayment_940b4725-45d0-483e-9e6c-f3e084826320" xlink:href="tree-20220630.xsd#tree_ContingentConsiderationPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_033f8a6b-cc10-4b7f-a49c-0766b6822e60" xlink:to="loc_tree_ContingentConsiderationPayment_940b4725-45d0-483e-9e6c-f3e084826320" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e8840cb7-5ad7-4aa0-b489-df089d7761b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_033f8a6b-cc10-4b7f-a49c-0766b6822e60" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e8840cb7-5ad7-4aa0-b489-df089d7761b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_9a3b578b-4a05-4d1d-8f07-206afa2f8577" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e8840cb7-5ad7-4aa0-b489-df089d7761b4" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_9a3b578b-4a05-4d1d-8f07-206afa2f8577" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_8ac53e1c-ccc0-4b34-b845-564e7edea2ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e8840cb7-5ad7-4aa0-b489-df089d7761b4" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_8ac53e1c-ccc0-4b34-b845-564e7edea2ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_89d59f7b-157f-45a0-aabf-ca59a2f6deaa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e8840cb7-5ad7-4aa0-b489-df089d7761b4" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_89d59f7b-157f-45a0-aabf-ca59a2f6deaa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_544b02ee-6307-4142-b955-b164327a18ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_5231749f-977c-4e7f-abc5-377a9d73ac95" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e8840cb7-5ad7-4aa0-b489-df089d7761b4" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_5231749f-977c-4e7f-abc5-377a9d73ac95" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_9e7d5067-1b99-4b4a-9d6f-f816b8552884" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_e8840cb7-5ad7-4aa0-b489-df089d7761b4" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_9e7d5067-1b99-4b4a-9d6f-f816b8552884" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_2b75840b-1154-4c49-97ca-eccdca6dea31" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_05842e91-3fee-482b-801f-42a1a5f05146" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_033f8a6b-cc10-4b7f-a49c-0766b6822e60" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_05842e91-3fee-482b-801f-42a1a5f05146" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_67175485-a195-4f0f-abb3-a7d372f7ac3a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_05842e91-3fee-482b-801f-42a1a5f05146" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_67175485-a195-4f0f-abb3-a7d372f7ac3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_67175485-a195-4f0f-abb3-a7d372f7ac3a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_67175485-a195-4f0f-abb3-a7d372f7ac3a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_67175485-a195-4f0f-abb3-a7d372f7ac3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2022191f-1739-43e0-a603-19f52ba00b9f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_67175485-a195-4f0f-abb3-a7d372f7ac3a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2022191f-1739-43e0-a603-19f52ba00b9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_QuoteWizardMember_284a5b4c-a20c-42b5-8656-88e5b62cf0a1" xlink:href="tree-20220630.xsd#tree_QuoteWizardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2022191f-1739-43e0-a603-19f52ba00b9f" xlink:to="loc_tree_QuoteWizardMember_284a5b4c-a20c-42b5-8656-88e5b62cf0a1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/SEGMENTINFORMATIONDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#SEGMENTINFORMATIONDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/SEGMENTINFORMATIONDetails" xlink:type="extended" id="ic48222ce2e2a44ad84dbe48b5f05fc9c_SEGMENTINFORMATIONDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_ea59d831-a661-4442-93ea-81f913841ff7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_NumberOfOperatingSegments_ea59d831-a661-4442-93ea-81f913841ff7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_ee4363c1-beff-4533-a8d2-36ff12ce6820" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_NumberOfReportableSegments_ee4363c1-beff-4533-a8d2-36ff12ce6820" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_1bb621cf-381c-424e-8b50-7bdf0e683567" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_Revenues_1bb621cf-381c-424e-8b50-7bdf0e683567" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketingExpense_ad077220-2cbb-41a3-bb30-1dd7313ae04e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_MarketingExpense_ad077220-2cbb-41a3-bb30-1dd7313ae04e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_f026eb8d-e7aa-4350-be95-c8deb6cc37b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_GrossProfit_f026eb8d-e7aa-4350-be95-c8deb6cc37b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostOfOperatingRevenue_83d8c945-a158-481e-b17e-f0ed5db2febd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCostOfOperatingRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_OtherCostOfOperatingRevenue_83d8c945-a158-481e-b17e-f0ed5db2febd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSellingAndMarketingExpense_eb082e02-dc99-43d3-869c-10ba1105263d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherSellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_OtherSellingAndMarketingExpense_eb082e02-dc99-43d3-869c-10ba1105263d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_4fcb6398-b9ea-4ed2-a788-18243739f78c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_4fcb6398-b9ea-4ed2-a788-18243739f78c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_55279cfe-ba09-42e9-8193-b701e1ae64ba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_55279cfe-ba09-42e9-8193-b701e1ae64ba" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_71c92325-c688-4b0e-bae9-dad60c116cfe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_71c92325-c688-4b0e-bae9-dad60c116cfe" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_4326c510-247b-45fe-b382-a00b1a22e0e3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_4326c510-247b-45fe-b382-a00b1a22e0e3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_34cc769d-0215-46bd-bce7-7c1d9bf17b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_34cc769d-0215-46bd-bce7-7c1d9bf17b0d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_745eb281-b51a-42e8-be0b-0e6987fbe812" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_RestructuringCharges_745eb281-b51a-42e8-be0b-0e6987fbe812" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossRelatedToLitigationSettlement_81c6cf8e-b490-40fd-be5f-5c0900b8a171" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossRelatedToLitigationSettlement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_GainLossRelatedToLitigationSettlement_81c6cf8e-b490-40fd-be5f-5c0900b8a171" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_5485b8c8-7d93-4f8f-823d-2f637fd432e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_OperatingIncomeLoss_5485b8c8-7d93-4f8f-823d-2f637fd432e4" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_be5a23c4-e885-4ecc-9eb6-ece9e23cb6ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_be5a23c4-e885-4ecc-9eb6-ece9e23cb6ac" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_2fd3deba-e60c-41da-bcea-5b68f165597b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_2fd3deba-e60c-41da-bcea-5b68f165597b" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8f5316e5-519b-477a-ab12-7b7d22dbf967" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8f5316e5-519b-477a-ab12-7b7d22dbf967" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_722cb75d-d101-4262-bcf8-0c8659221dae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_5f5a1bfd-1bcf-4134-8048-9bcc42552520" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_722cb75d-d101-4262-bcf8-0c8659221dae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_5f60f79a-dfcb-4b6f-a33b-c7c62752cec4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_722cb75d-d101-4262-bcf8-0c8659221dae" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_5f60f79a-dfcb-4b6f-a33b-c7c62752cec4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5f60f79a-dfcb-4b6f-a33b-c7c62752cec4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5f60f79a-dfcb-4b6f-a33b-c7c62752cec4" xlink:to="loc_us-gaap_SegmentDomain_5f60f79a-dfcb-4b6f-a33b-c7c62752cec4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_e21fef75-410f-4f43-b52c-022cb3729adf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5f60f79a-dfcb-4b6f-a33b-c7c62752cec4" xlink:to="loc_us-gaap_SegmentDomain_e21fef75-410f-4f43-b52c-022cb3729adf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_HomeSegmentMember_ff6f7003-f9a3-4d44-912b-fcd926c9bd6c" xlink:href="tree-20220630.xsd#tree_HomeSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e21fef75-410f-4f43-b52c-022cb3729adf" xlink:to="loc_tree_HomeSegmentMember_ff6f7003-f9a3-4d44-912b-fcd926c9bd6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_ConsumerSegmentMember_c53cb937-cee8-4d03-bb4f-9ec0b0dfb041" xlink:href="tree-20220630.xsd#tree_ConsumerSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e21fef75-410f-4f43-b52c-022cb3729adf" xlink:to="loc_tree_ConsumerSegmentMember_c53cb937-cee8-4d03-bb4f-9ec0b0dfb041" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_InsuranceSegmentMember_3280bbb7-8819-442c-984c-bef6d7945cdd" xlink:href="tree-20220630.xsd#tree_InsuranceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e21fef75-410f-4f43-b52c-022cb3729adf" xlink:to="loc_tree_InsuranceSegmentMember_3280bbb7-8819-442c-984c-bef6d7945cdd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllOtherSegmentsMember_ae67e4dd-73d8-401e-82f3-a6ac9bf0ef2f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllOtherSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e21fef75-410f-4f43-b52c-022cb3729adf" xlink:to="loc_us-gaap_AllOtherSegmentsMember_ae67e4dd-73d8-401e-82f3-a6ac9bf0ef2f" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.tree.com/role/RESTRUCTURINGACTIVITIESDetails" xlink:type="simple" xlink:href="tree-20220630.xsd#RESTRUCTURINGACTIVITIESDetails"/>
  <link:definitionLink xlink:role="http://www.tree.com/role/RESTRUCTURINGACTIVITIESDetails" xlink:type="extended" id="i0a79a0bfcde0405cb474f388c5bdbe6d_RESTRUCTURINGACTIVITIESDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_341501b3-04d4-4198-8b18-cdd34a510829" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_a38dabc9-34e0-4e71-ac27-a1dbb3167024" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_341501b3-04d4-4198-8b18-cdd34a510829" xlink:to="loc_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_a38dabc9-34e0-4e71-ac27-a1dbb3167024" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_13d6b5cb-4fea-4df4-a3a8-0f2543079096" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_341501b3-04d4-4198-8b18-cdd34a510829" xlink:to="loc_us-gaap_RestructuringCharges_13d6b5cb-4fea-4df4-a3a8-0f2543079096" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeveranceCosts1_8fd21911-1c0a-4d5f-91ce-eed1966d0626" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeveranceCosts1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_341501b3-04d4-4198-8b18-cdd34a510829" xlink:to="loc_us-gaap_SeveranceCosts1_8fd21911-1c0a-4d5f-91ce-eed1966d0626" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveSettledWithoutCash2_0fdeba49-9c56-4e24-a482-a88e9fa4405b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringReserveSettledWithoutCash2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_341501b3-04d4-4198-8b18-cdd34a510829" xlink:to="loc_us-gaap_RestructuringReserveSettledWithoutCash2_0fdeba49-9c56-4e24-a482-a88e9fa4405b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_db85298b-fe1c-4c29-9900-f7f9dec219a3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_341501b3-04d4-4198-8b18-cdd34a510829" xlink:to="loc_us-gaap_RestructuringReserveRollForward_db85298b-fe1c-4c29-9900-f7f9dec219a3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_f31363e7-3790-4f2a-91c8-99f47cdf2da4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_db85298b-fe1c-4c29-9900-f7f9dec219a3" xlink:to="loc_us-gaap_RestructuringReserve_f31363e7-3790-4f2a-91c8-99f47cdf2da4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_71c70536-1ed6-47ec-b606-6c4cb4f40b18" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringCharges"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_7bf15b34-f518-4856-a932-5dd6ea725427" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_db85298b-fe1c-4c29-9900-f7f9dec219a3" xlink:to="loc_us-gaap_PaymentsForRestructuring_7bf15b34-f518-4856-a932-5dd6ea725427" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveSettledWithoutCash2_a0322f10-cf43-4d4a-a6f1-409c8e78aac7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringReserveSettledWithoutCash2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_0953615d-84df-4e40-be20-3768f24d98b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringReserve"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_f72b5566-5ff8-42f0-b096-7b5f5ba2e045" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_341501b3-04d4-4198-8b18-cdd34a510829" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_f72b5566-5ff8-42f0-b096-7b5f5ba2e045" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_126a0171-7eaf-4b51-8823-081a8872e5d9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_f72b5566-5ff8-42f0-b096-7b5f5ba2e045" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_126a0171-7eaf-4b51-8823-081a8872e5d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_126a0171-7eaf-4b51-8823-081a8872e5d9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_126a0171-7eaf-4b51-8823-081a8872e5d9" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_126a0171-7eaf-4b51-8823-081a8872e5d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_eddfb644-acb9-4cf2-baf0-b8a2ddd7306b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_126a0171-7eaf-4b51-8823-081a8872e5d9" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_eddfb644-acb9-4cf2-baf0-b8a2ddd7306b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_26c0d7b9-71a3-405c-b449-f7a16ab684a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_eddfb644-acb9-4cf2-baf0-b8a2ddd7306b" xlink:to="loc_us-gaap_EmployeeSeveranceMember_26c0d7b9-71a3-405c-b449-f7a16ab684a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tree_NonCashCompensationMember_1d1b5930-6947-4c8a-8c3c-c10da824a3f9" xlink:href="tree-20220630.xsd#tree_NonCashCompensationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_eddfb644-acb9-4cf2-baf0-b8a2ddd7306b" xlink:to="loc_tree_NonCashCompensationMember_1d1b5930-6947-4c8a-8c3c-c10da824a3f9" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-roles-2022.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate202006Member" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountingStandardsUpdate202006Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember" xlink:to="loc_us-gaap_AccountingStandardsUpdate202006Member" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
