Etymology
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certify (v.)

mid-14c., "to declare the truth of," also "to vouch for or confirm" (an official record, etc.), from Old French certefiier "make certain, witness the truth of" (12c.), from Late Latin certificare "to certify, to make certain," from Latin certus "fixed, sure" (see certain) + root of facere "to make, do" (from PIE root *dhe- "to set, put"). Also used in Middle English in broader senses of "inform, give notice to; instruct, to direct; to designate." Related: Certified; certifying.

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Definitions of certify

certify (v.)
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes;
certify (v.)
guarantee payment on; of checks;
certify (v.)
authorize officially;
Synonyms: license / licence
certify (v.)
guarantee as meeting a certain standard;
certified grade AAA meat
Synonyms: endorse / indorse
certify (v.)
declare legally insane;
From wordnet.princeton.edu