certify — English Dictionary

Verb

1. To attest to (a fact) as the truth.

   Usage

   • Transitive

2. To authenticate or verify in writing.

   Usage

   • Transitive

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

   Usage

   • Transitive

   Examples

   These blankets have been certified as fireproof.

4. To inform; to tell (a person) that something is true.

   Usage

   • Archaic
   • Transitive

   Examples

   More examples (1)

   Our deeds do us three manners of service. First, they certify us that we are heirs of everlasting life, and that the Spirit of God, which is the earnest thereof, is in us.

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

   Usage

   • Archaic
   • Reflexive

   Examples

   After having certified himself of her own good health, he very kindly inquired about her mother and Miss Sophy […].

Verb

1. provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes

   Synonyms

   attestmanifestdemonstrateevidence

   Broader terms

   testifybear witnessproveevidenceshow

   Examples

   His high fever attested to his illness

   The buildings in Rome manifest a high level of architectural sophistication

   More examples (1)

   This decision demonstrates his sense of fairness

2. guarantee payment on; of checks

   Broader terms

   secure

3. authorize officially

   Synonyms

   licenselicence

   Antonyms

   decertify

   Broader terms

   authorizeauthorisepassclear

   Examples

   I am licensed to practice law in this state

4. guarantee as meeting a certain standard

   Synonyms

   endorseindorse

   Broader terms

   guaranteewarrant

   Examples

   certified grade AAA meat

5. declare legally insane

   Broader terms

   declareadjudgehold