Aire, the name of two French towns. 1. In the Pas de Calais, 10 miles S.E. of St. Omer, possessing barracks and manufactories of hats, cotton, wool, soap, etc. Pop. about 9,000. 2. In the Landes, on the left bank of the Adour, the ancient capital of the Visigoths, and the seat of a bishopric.