certify

1 to declare (something) to be true or genuine experts certified the letter as indeed having been written by Abraham Lincoln Synonyms of certify attest, authenticate, avouch, testify (to), vouch (for), witness Words Related to certify guarantee, warrant; affirm, assert, aver, avow, profess, vow

2 to give official or legal power to certified her as a teacher Synonyms of certify accredit, authorize, charter [British], commission, empower, enable, invest, license (also licence), qualify, vest, warrantWords Related to certify approve, clear, credential, endorse (also indorse), OK (or okay), sanction; affirm, confirm, validate; inaugurate, induct, initiate, install, instate, swear in; allow, let, permit; enfranchise, entitle, privilegeNear Antonyms of certify ban, bar, block, constrain, deny, disallow, disbar, discourage, disenfranchise, disfranchise, exclude, hinder, hold back, impede, inhibit, obstruct, prevent, shut out, stop; enjoin, forbid, interdict, outlaw, prohibit, proscribe, vetoAntonyms of certify disqualify

3 to give evidence or testimony to the truth or factualness of please bring in a doctor's note to certify that you were really sick Synonyms of certify argue, attest, authenticate, bear out, confirm, corroborate, substantiate, support, validate, verify, vindicateWords Related to certify 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 of certify contradict, gainsay; deny, disavow, disclaim; challenge, contest, dispute, questionAntonyms of certify disprove, rebut, refute