signatory
n. C1 Advanced US //ˈsɪɡnəˌtɔɹi// UK //sˈɪɡnətəɹˌi// sig·na·to·ry
n. a person who signs a document to show they agree to it. You are a signatory if you put your name on a contract, a treaty, or a petition.
n. a person who signs a document, such as a treaty, contract, or petition, to indicate their agreement or legal obligation. Often used in formal or legal contexts.
The signatory of the contract must appear in person.
The treaty requires at least fifty signatories before it can become an official international law.
As a primary signatory of the peace agreement, the diplomat was responsible for ensuring that all terms were strictly adhered to by the participating nations.
From Latin signatorius.