One who certificates.

An official document certifying the details of a person's birth. Name, date, and parents' names are always present; details such as parents' occupation and religion may be included.

Alternative form of birth certificate

(computing) a public key certificate

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

A type of bank account representing a time deposit, which is insured, with a specific, fixed term, and, usually, a fixed interest rate.

(law, US) A legal document issued by a federal or state regulatory agency with authority over an area which affirms that a proposed acquisition, expansion, or creation of a facility falling under that authority is required to fulfill the needs of a community.

plural of Certificate of Need

A paper certifying its bearer's ownership of shares (in a certain quantity) in a corporation.

plural of stock certificate