Synonyms for authenticate
See authenticate in Webster's New World Roget's A-Z Thesaurus II
verb
To assure the certainty or validity of:
attest, back (up), bear out, confirm, corroborate, evidence, justify, substantiate, testify (to), validate, verify, warrant. See support, trueTo establish as true or genuine:
bear out, confirm, corroborate, demonstrate, endorse, establish, evidence, prove, show, substantiate, validate, verify. See show, support
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