From Old French certefier (confirm, assure, make certain). Compare French certifier.


certify (third-person singular simple present certifies, present participle certifying, simple past and past participle certified)

  1. (transitive) To attest to (a fact) as the truth.
  2. (transitive, law) To authenticate or verify in writing.
  3. (transitive) To attest that a product, service, organization, or person has met an official standard.
    These blankets have been certified as fireproof.
  4. (transitive, archaic) To inform; to tell (a person) that something is true.
    • 1847, The Church of England Magazine (volume 23, page 239)
      Our deeds do us three manners of service. First, they certify us that we are heirs of everlasting life, and that the Spirit of God, which is the earnest thereof, is in us.
  5. (archaic, reflexive) To assure (oneself) of something; to ascertain.
    • 1751, Tobias Smollett, The Adventures of Peregrine Pickle, vol. III, ch. 80:
      After having certified himself of her own good health, he very kindly inquired about her mother and Miss Sophy [] .


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  • certify at OneLook Dictionary Search
  • certify in The Century Dictionary, New York, N.Y.: The Century Co., 1911.