from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To confirm formally as true, accurate, or genuine.
  • transitive v. To guarantee as meeting a standard: butter that was certified Grade A. See Synonyms at approve.
  • transitive v. 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.
  • transitive v. To issue a license or certificate to.
  • transitive v. To declare to be in need of psychiatric treatment or confinement.
  • transitive v. Archaic To inform positively; assure.
  • intransitive v. To testify: certify to the facts.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. to attest to as the truth or meeting a standard

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To give cetain information to; to assure; to make certain.
  • transitive v. To give certain information of; to make certain, as a fact; to verify.
  • transitive v. To testify to in writing; to make a declaration concerning, in writing, under hand, or hand and seal.

from The Century Dictionary and Cyclopedia

  • To assure or make certain (of); give certain information to; tell positively: applied to persons, and followed by of before the thing told about, or by that before a verb and its nominative: as, I certified you of the fact.
  • To give certain information of; make clear, definite, or certain; vouch for: applied to things.
  • To testify to or vouch for in writing; make a declaration of in writing under hand, or hand and seal; make known or establish as a fact.
  • To testify; declare the truth; make a certification or certificate.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. guarantee as meeting a certain standard
  • v. provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
  • v. declare legally insane
  • v. guarantee payment on; of checks
  • v. authorize officially


from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English certifien, from Old French certifier, from Late Latin certificāre : Latin certus, certain; see certain + Latin -ficāre, -fy.



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