(transitive) To attest to (a fact) as the truth. / (transitive, law) To authenticate or verify in writing.

present participle of certify

simple past tense and past participle of certify

(of a document) That can, or that must be certified. / (informal, of a person) Mentally ill to such an extent that involuntary institutionalization is appropriate; crazy.

(informal) A crazy person.

With the potential for certification. / Genuinely / To a great extent. / Undoubtedly, demonstrably.

Third-person singular simple present indicative form of certify

plural of certifier

A person or entity that provides certification

plural of certifiable