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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e4bd1-2e7b-7984-8730-5a81c5d8f9fe,g:89e11f71-6945-4437-9151-139eebc6836a-->
<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.teladoc.com/role/Cover" xlink:type="simple" xlink:href="tdoc-20260521.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.teladoc.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019e4bd1-2e7b-7754-b86e-05b7eabeb9c2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_DocumentInformationTable_019e4bd1-2e7b-7754-b86e-05b7eabeb9c2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesAddressTypeAxis_019e4bd1-2e7b-7973-8400-ff5cc44aed6a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressesAddressTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019e4bd1-2e7b-7754-b86e-05b7eabeb9c2" xlink:to="loc_dei_EntityAddressesAddressTypeAxis_019e4bd1-2e7b-7973-8400-ff5cc44aed6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_019e4bd1-2e7b-7973-8400-ff5cc44aed6a_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_019e4bd1-2e7b-7973-8400-ff5cc44aed6a" xlink:to="loc_dei_AddressTypeDomain_019e4bd1-2e7b-7973-8400-ff5cc44aed6a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_019e4bd1-2e7b-78cc-a06d-1c9ccce0dbb0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_019e4bd1-2e7b-7973-8400-ff5cc44aed6a" xlink:to="loc_dei_AddressTypeDomain_019e4bd1-2e7b-78cc-a06d-1c9ccce0dbb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_FormerAddressMember_019e4bd1-2e7b-723f-860c-2adc166808a8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_FormerAddressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_AddressTypeDomain_019e4bd1-2e7b-78cc-a06d-1c9ccce0dbb0" xlink:to="loc_dei_FormerAddressMember_019e4bd1-2e7b-723f-860c-2adc166808a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e4bd1-2e7b-7978-9ded-0546c138ba34" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_DocumentType_019e4bd1-2e7b-7978-9ded-0546c138ba34" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019e4bd1-2e7b-731b-bf56-5c0e86a5453f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_DocumentPeriodEndDate_019e4bd1-2e7b-731b-bf56-5c0e86a5453f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e4bd1-2e7b-70a2-beb5-9a601ce9456f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_EntityRegistrantName_019e4bd1-2e7b-70a2-beb5-9a601ce9456f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019e4bd1-2e7b-7cd6-bde9-64f5644c40ff" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019e4bd1-2e7b-7cd6-bde9-64f5644c40ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019e4bd1-2e7b-73ee-9c49-9a3a3db04622" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_EntityFileNumber_019e4bd1-2e7b-73ee-9c49-9a3a3db04622" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e4bd1-2e7b-724d-bdf3-1d71b7078a65" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e4bd1-2e7b-724d-bdf3-1d71b7078a65" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019e4bd1-2e7b-7bc3-ac4c-3e41f2f63096" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_EntityAddressAddressLine1_019e4bd1-2e7b-7bc3-ac4c-3e41f2f63096" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019e4bd1-2e7b-70af-b5ba-8c76e29b927f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_EntityAddressAddressLine2_019e4bd1-2e7b-70af-b5ba-8c76e29b927f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019e4bd1-2e7b-706b-b11a-91509d2cafc2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_EntityAddressCityOrTown_019e4bd1-2e7b-706b-b11a-91509d2cafc2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019e4bd1-2e7b-761a-823a-551ef8524fbd" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_EntityAddressStateOrProvince_019e4bd1-2e7b-761a-823a-551ef8524fbd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019e4bd1-2e7b-7138-b7c7-94f1aef7b0fd" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_EntityAddressPostalZipCode_019e4bd1-2e7b-7138-b7c7-94f1aef7b0fd" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019e4bd1-2e7b-7722-8b58-e36a44873cd2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_CityAreaCode_019e4bd1-2e7b-7722-8b58-e36a44873cd2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019e4bd1-2e7b-7c0b-8f3b-35913ce205aa" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_LocalPhoneNumber_019e4bd1-2e7b-7c0b-8f3b-35913ce205aa" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019e4bd1-2e7b-7e48-9415-87f909067802" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_WrittenCommunications_019e4bd1-2e7b-7e48-9415-87f909067802" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019e4bd1-2e7b-7831-9cd0-e2ed57f35697" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_SolicitingMaterial_019e4bd1-2e7b-7831-9cd0-e2ed57f35697" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019e4bd1-2e7b-7eed-8569-bf38d9d186ac" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_PreCommencementTenderOffer_019e4bd1-2e7b-7eed-8569-bf38d9d186ac" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019e4bd1-2e7b-76e5-8048-563810c31e4c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019e4bd1-2e7b-76e5-8048-563810c31e4c" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019e4bd1-2e7b-70c6-8484-011ba20ded82" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_Security12bTitle_019e4bd1-2e7b-70c6-8484-011ba20ded82" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019e4bd1-2e7b-70d4-971b-9b7f1db04d8a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_TradingSymbol_019e4bd1-2e7b-70d4-971b-9b7f1db04d8a" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019e4bd1-2e7b-7ef9-ac55-42dbf52321f8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_SecurityExchangeName_019e4bd1-2e7b-7ef9-ac55-42dbf52321f8" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019e4bd1-2e7b-70c8-a06e-c1eab91d99bf" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_EntityEmergingGrowthCompany_019e4bd1-2e7b-70c8-a06e-c1eab91d99bf" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e4bd1-2e7b-7709-afc8-bfae03bdcb7a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_AmendmentFlag_019e4bd1-2e7b-7709-afc8-bfae03bdcb7a" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e4bd1-2e7b-784b-b174-80c2e85abc56" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4bd1-2e7b-789c-9363-057d67b2cccd" xlink:to="loc_dei_EntityCentralIndexKey_019e4bd1-2e7b-784b-b174-80c2e85abc56" xlink:type="arc" order="22"/>
  </link:definitionLink>
</link:linkbase>
