(computing) A certificate that uses a digital signature to bind together a public key with an identity — used to verify that a public key belongs to an individual.

(computing) a public key certificate

(computing) An organization that issues digital certificates for use by other parties.

Obsolete spelling of certain

Obsolete spelling of certain

simple past tense and past participle of certify

definitely, positively, without doubt

(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.