Cincinnatian adjective 1noun 1forms 3 adjective1 •Of or pertaining to the city of Cincinnati in Ohio. noun1 •An inhabitant of Cincinnati.While Fortescue Cuming could entertain a cabinful of young men with a violin in 1807, Frances Trollope noted that Cincinnatians organized formal balls for young people of quality twenty years later. — 2015 formsCincinnatians · more Cincinnatian · most Cincinnatian