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certify, attest, witness, vouch mean to testify to the truth or genuineness of something. certify usually applies to a written statement, especially one carrying a signature or seal.

CERTIFY definition: to attest as certain; give reliable information of; confirm. See examples of certify used in a sentence.

CERTIFY definition: 1. to say in a formal or official way, usually in the form of an official document, that something…. Learn more.

Definition of certify verb in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

If someone in an official position certifies something, they officially state that it is true. The president certified that the project would receive $650m from overseas sources. [VERB that] The National …

To vouch for the authenticity of something: certify to the facts. [Middle English certifien, from Old French certifier, from Late Latin certificāre : Latin certus, certain; see certain + Latin -ficāre, -fy.] cer′ti·fi′er n. …