certify

What it means

1. transitiveTo attest to (a fact) as the truth.
2. transitivelawTo authenticate or verify in writing.
3. transitiveTo attest that a product, service, organization, or person has met an official standard.

   These blankets have been certified as fireproof.

   Synonyms: attest, witness, vouch for, approve, confirm

In a sentence

These blankets have been certified as fireproof.

Where it comes from

1. Old Frenchcertefier“confirm, assure, make certain”
2. Englishcertify

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