cio cinurous • cion · · · Info · Definitions · Characters · · cio · · Text Latin · · Script 3 · · Length 1 · · Syllables Definitions · · · (noun) a federation of North American industrial unions that merged with the American Federation of Labor in 1955. Synonyms: Congress of Industrial Organizations, CIO. · · Noun Definition 1 Characters · · c latin small letter c U+0063 i latin small letter i U+0069 o latin small letter o U+006F