signatory

Bound by signed agreement.

One who has signed a contract or other legal document as a party.

A country that is a party to a treaty.

One who is bound by signature to the terms of an agreement; specifically, a party or state bound jointly with several others by the signing of a public treaty or convention.

Pertaining to or used in sealing: as, a signatory ring.

That has signed, or signed and sealed; bound by signature and seal, as to the terms of a contract or agreement: used specifically, in the phrase signatory powers, of the sovereign parties to a general treaty or convention, as that of Paris in 1856, or that of Berlin in 1878.

Relating to a seal; used in sealing.

Signing; joining or sharing in a signature.

A signer; one who signs or subscribes.

One who signs or signed something.