Cosignitary

• (a.) Signing some important public document with another or with others; as, a treaty violated by one of the cosignitary powers. • (n.) One who signs a treaty or public document along with others or another; as, the cosignitaries of the treaty of Berlin.
Found on http://thinkexist.com/dictionary/meaning/cosignitary/

Cosignitary

Co·sig'ni·ta·ry adjective [ Prefix co- + sign . Confer Signatory .] Signing some important public document with another or with others; as, a treaty violated by one of the cosignitary powers.
Found on http://www.encyclo.co.uk/webster/C/167
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