a. and sb. [f. CO- + SIGNATORY.]
A. adj. Signing jointly with others, uniting with others in signing.
1891. Daily News, 21 Nov., 5/5. They besought the protection of the co-signatory powers to the Berlin guarantees against the ruthless oppression of the lawless and ruffianly Kurds.
B. sb. One who signs (a document, treaty, etc.) jointly with another or others; a joint signatory.
1865. Pall Mall Gaz., 29 Sept., 4/2. It is thought that Austria … will avoid the difficulty of becoming a co-signatory of Italy.
1867. C. W. Bingham, in Times, 9 Nov., 10/1. He has requested me to acknowledge on behalf of ourselves and our co-signatories the receipt of your courteous reply.
