verb (used with object), cer·ti·fied, cer·ti·fy·ing.

  1. to attest as certain; give reliable information of; confirm: He certified the truth of his claim.
  2. to testify to or vouch for in writing: The medical examiner will certify his findings to the court.
  3. to guarantee; endorse reliably: to certify a document with an official seal.
  4. to guarantee (a check) by writing on its face that the account against which it is drawn has sufficient funds to pay it.
  5. to award a certificate to (a person) attesting to the completion of a course of study or the passing of a qualifying examination.
  6. to declare legally insane and committable to a mental institution.
  7. Archaic. to assure or inform with certainty.

verb (used without object), cer·ti·fied, cer·ti·fy·ing.

  1. to give assurance; testify; vouch for the validity of something (usually followed by to).

verb -fies, -fying or -fied

  1. to confirm or attest (to), usually in writingthe letter certified her age
  2. (tr) to endorse or guarantee (that certain required standards have been met)
  3. to give reliable information or assuranceshe certified that it was Walter’s handwriting
  4. (tr) to declare legally insane
  5. (tr) US and Canadian (of a bank) to state in writing on (a cheque) that payment is guaranteed

mid-14c., “to declare the truth of,” also “to vouch for or confirm” (an official record, etc.), from Old French certefiier “make certain, witness the truth of” (12c.), from Late Latin certificare “to certify, to make certain,” from Latin certus (see certain) + root of facere “to make, do” (see factitious). Also used in Middle English in broader senses of “inform, give notice; instruct, to direct; to designate.” Related: Certified; certifying. Certified public accountant attested from 1896.

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