attest

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verb

Definition of ATTEST

1

to declare (something) to be true or genuine <the appraiser attests that the lamp is indeed an original Tiffany>

Synonyms attest, authenticate, avouch, testify (to), vouch (for), witness

Related Words guarantee, warrant; affirm, assert, aver, avow, profess, vow

2

to make a solemn declaration under oath for the purpose of establishing a fact <an eyewitness who will attest to my innocence>

Synonyms attest, depose, swear, witness

Related Words verify; vouch; promise, vow

3

to give evidence or testimony to the truth or factualness of <I'll attest that she was at the party>

Synonyms argue, attest, authenticate, bear out, certify, corroborate, substantiate, support, validate, verify, vindicate

Related Words avouch, back (up), testify (to), vouch (for), witness; guarantee, warrant; affirm, assert, aver, avow, declare, profess; demonstrate, document, establish, prove, reinforce (also reenforce)

Near Antonyms contradict, gainsay; deny, disavow, disclaim; challenge, contest, dispute, question

Antonyms disprove, rebut, refute