9
check(verb, support, show, determine, back)
9
document(noun, verb, show, determine, detail)
9
justify(verb, support, show, determine, back)
9
sanction(verb, support, state, favor, back)
8
accredit(verb, support, state, praise, favor)
8
sustain(verb, support, show, determine, praise)
7
notarize(verb, sign, authorize, endorse, witness)
7
uphold(verb, support, show, determine, favor)
6
vouch(verb, support, state, back, sign)
5
accept(verb, approve, authorize, sanction, legalize)
5
back up(verb, expression, support, praise, favor)
5
countersign(verb, state, show, sign, approve)
5
guarantee(verb, support, state, praise, settle)
5
permit(verb, approve, authorize)
5
seal(verb, show, settle, sign, confirm)
5
testify(verb, support, state, show, determine)
5
vouch for(verb, expression, support, show, praise)
5
witness(verb, support, state, show, determine)
4
assent(noun, verb, approve, authorize)
4
avouch(verb, evince)
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APASmart Define. (2015). authenticate thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/authenticate/thesaurus/synonyms
ChicagoSmart Define. 2015. "authenticate thesaurus" https://smartdefine.org/authenticate/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, authenticate thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/authenticate/thesaurus/synonyms>.
MLASmart Define. "authenticate thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/authenticate/thesaurus/synonyms>