Definition of certify in English:

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Pronunciation: /ˈsərdəˌfī/

verb (certifies, certifying, certified)

[with object]
1Attest or confirm in a formal statement: the profits for the year had been certified by the auditors [with clause]: the medical witness certified that death was due to cerebral hemorrhage
More example sentences
  • He certifies the statements made above are correct and complete.
  • He was certified dead at Fairfield General Hospital.
  • The man, in his early 20s, was certified dead at the scene.
verify, guarantee, attest, validate, confirm, substantiate, endorse, vouch for, testify to;
provide evidence, give proof, prove, demonstrate
1.1 (often as adjective certified) Officially recognize (someone or something) as possessing certain qualifications or meeting certain standards: a certified scuba instructor board certified in obstetrics and gynecology
More example sentences
  • Choke holds should be taught only by qualified and certified instructors.
  • To do the review we wanted pathologists who were board certified and had extensive clinical experience, and we wanted to limit the number of reviewers to only a few.
  • I was board certified in general surgery in 1991, and in plastic surgery in 1993.
accredit, recognize, license, authorize, approve, warrant
1.2Officially declare insane.
Example sentences
  • With the exception of those who can be certified insane, these homeless people cannot be detained anywhere against their will.
  • My husband and I have been happily married for 27 years and are known to be certified insane.
  • Only four of the eighteen are, or have been, certified insane.


Middle English: from Old French certifier, from late Latin certificare, from Latin certus 'certain'.

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