1. (verb) attest, certify, manifest, demonstrate, evidence
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
Synonyms: licence, certify, demo, testify, license, march, prove, evidence, take the stand, demonstrate, attest, bear witness, shew, indorse, present, exhibit, establish, tell, endorse, manifest, show
Antonyms: decertify, derecognise, derecognize
2. (verb) certify
guarantee payment on; of checks
Synonyms: indorse, demonstrate, license, evidence, attest, licence, manifest, endorse
Antonyms: derecognise, derecognize, decertify
3. (verb) license, licence, certify
authorize officially
Synonyms: indorse, demonstrate, license, evidence, attest, licence, manifest, certify, endorse
Antonyms: derecognize, decertify, derecognise
4. (verb) certify, endorse, indorse
guarantee as meeting a certain standard
Synonyms: indorse, back, demonstrate, license, evidence, plunk for, attest, licence, manifest, plump for, second, certify, support, endorse
Antonyms: derecognize, derecognise, decertify
5. (verb) certify
declare legally insane
Synonyms: indorse, demonstrate, license, evidence, attest, licence, manifest, endorse
Antonyms: decertify, derecognise, derecognize
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Synonyms and Antonyms of certify 
