1. a person, organization, or country that has signed an official agreement or document

1. having signed or being bound by a signed agreement

Examples

• The United States was one of the original signatories to the treaty.
• All signatories must comply with the terms of the agreement.
• The company became a signatory to the environmental protection pact.
• Each signatory nation agreed to reduce carbon emissions.
• The signatory countries met to discuss implementation.
• As a signatory member, we have certain obligations to fulfill.