AUXONNE (formerly Assonium, i.e., ad Sonam, from its position on the Saone), a city of France, in the arrondissement of Dijon and department of Côte d'Or. It is strongly fortified, and possesses an old castle, an arsenal, and a school of artillery. Besides their manufactures of cloth and serges, the inhabitants carry on by the river considerable traffic with Lyons in wine, grain, and wood. Long. 5° 24′ E., lat. 47° 13′ N. Population, 5911.