signatory

noun
UK /ˈsɪɡnətəri/
US /ˈsɪɡnətɔːri/

A signatory is a person or group that writes their name on an important paper to agree to it.

The two countries became signatories of the peace treaty.


OTHER MEANINGS

2. A person who formally signs a document to show approval or commitment.

Each signatory received a copy of the signed contract.

3. A country or organization that has signed an international agreement.

The signatories promised to reduce pollution.

4. Used as an adjective to describe someone or something that has signed a document.

The signatory nations met to discuss the new rules.