certify.
To attest to (a fact) as the truth.
Meaning & usage
To attest to (a fact) as the truth.
To authenticate or verify in writing.
To attest that a product, service, organization, or person has met an official standard.
These blankets have been certified as fireproof.
To inform; to tell (a person) that something is true.
To assure (oneself) of something; to ascertain.
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.