1. (noun) one of two or more signers of the same document (as a treaty or declaration)

• cosignatory

1. (noun) one of two or more signers of the same document (as a treaty or declaration)

• signatory
• signer

2. (noun) a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety)

• signatory
• signer

1. (noun) one of two or more signers of the same document (as a treaty or declaration)

• co-sign
• cosign

2. (noun) a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety)

• co-sign
• cosign