Châ•lons(sha lôn′),USA pronunciationn.Also called Châ•lonssur-Marne(sha lôn syr marn′).USA pronunciation a city in and the capital of Marne, in NE France: defeat of Attila a.d. 451. 55,709.Also called Châ•lons-sur-Saône(sha lôn syrsōn′).USA pronunciation a city in E France, on the Saône River. 60,451.