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ENGLISH · A WORD WITH POSSIBILITIES

certify.

To attest to (a fact) as the truth.

7 characters3 syllables approx.English language

Meaning & usage

verb/ˈsɜː.tɪ.faɪ/Received-Pronunciation/ˈsɝ.tɪ.faɪ/Canada, General-American[ˈsɝ.ɾɪ.faɪ]Canada, General-American/ˈsɜː.tɪ.fɑe/Australia
  1. To attest to (a fact) as the truth.

    transitive
  2. To authenticate or verify in writing.

    transitive
  3. To attest that a product, service, organization, or person has met an official standard.

    transitive
    These blankets have been certified as fireproof.
  4. To inform; to tell (a person) that something is true.

    archaic · transitive
  5. To assure (oneself) of something; to ascertain.

    archaic · reflexive
Where this word comes from

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

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.