an arrondissement in the department of the Eure and Loire, in France, extending over 620 square miles, and divided into seven cantons and 138 communes, with 71,506 inhabitants. The chief city, of the same name, is situated on the river Blaise, and contains 860 houses, with 6037 inhabitants. Long. 1. 16. 19. E. Lat. 48. 44. 17. N.