cosignatory

Từ điển WordNet v3.1 - WordNet Dictionary

I - noun

one of two or more signers of the same document (as a treaty or declaration)
• Syn:
cosigner
• Derivationally related forms:
cosign (for: cosigner)
• Hypernyms:
signer, signatory

II - adjective

signing jointly with others
• Similar to:
joint