cosignatory coshery • cosigner · · · Info · Definitions · Synonyms · Characters · · cosignatory · · Text Latin · · Script 11 · · Length Definitions · · · (noun) one of two or more signers of the same document (as a treaty or declaration). Synonyms: cosigner. · · Noun Definition 1 (adj) signing jointly with others. · · Adjective Definition 1 Synonyms · · · cosigner · · Synonym 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 g latin small letter g U+0067 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079