Synonyms & Antonyms of certify

1 to declare (something) to be true or genuine
  • experts certified the letter as indeed having been written by Abraham Lincoln

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2 to give official or legal power to
  • certified her as a teacher

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Antonyms for certify

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

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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. certified that the candidate had met all requirements attest applies to oral or written testimony usually from experts or witnesses. attested to the authenticity of the document witness applies to the subscribing of one's own name to a document as evidence of its genuineness. witnessed the signing of the will vouch applies to one who testifies as a competent authority or a reliable person. willing to vouch for her integrity

synonyms see in addition approve

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Time Traveler for certify

Time Traveler

The first known use of certify was in the 14th century

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Cite this Entry

“Certify.” The Thesaurus, Merriam-Webster Inc., Accessed 29 January 2020.

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Dictionary: Definition of certify

Rhyming Dictionary: Words that rhyme with certify

Medical Dictionary: Definition of certify

Spanish Central: Translation of certify

Nglish: Translation of certify for Spanish Speakers

Britannica English: Translation of certify for Arabic Speakers

Comments on certify

What made you want to look up certify? Please tell us where you read or heard it (including the quote, if possible).


to assert without proof or before proving

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