transitive verb-·fied·, -·fy·ing
- to declare (a thing) true, accurate, certain, etc. by formal statement, often in writing; verify; attest
- to declare officially insane and committable to a mental institution
- to guarantee the quality or worth of (a check, document, etc.); vouch for
- to issue a certificate or license to
- Archaic to assure; make certain
Origin of certifyMiddle English certifien from Old French certifier from Late Latin certificare from Classical Latin certus, certain + -fy
verbcer·ti·fied, cer·ti·fy·ing, cer·ti·fies
- a. To confirm formally as true, accurate, or genuine: The police certified that a suspect had been arrested.b. To guarantee as meeting a standard: butter that was certified Grade A.
- To acknowledge in writing on the face of (a check) that the signature of the maker is genuine and that there are sufficient funds on deposit for its payment.
- To issue a license or certificate to.
- To declare to be in need of psychiatric treatment or confinement.
- Archaic To inform positively; assure.
Origin of certifyMiddle English certifien from Old French certifier from Late Latin certificāre Latin certus certain ; see certain . Latin -ficāre -fy
(third-person singular simple present certifies, present participle certifying, simple past and past participle certified)
From Old French certefier (“confirm, assure, make certain”). Compare French certifier.
certify - Legal Definition
- To attest, authenticate, or verify something in writing.
- To issue a certificate.
- To judicially determine that a person is mentally or otherwise not competent.
- To judicially determine that a group of individuals or entities meets the requirements to proceed with a class action. See also certification and decertify.