JESI, a city of Italy, in the province of Ancona, in the papal dominions. It is the see of a bishop, and contains a cathedral, five churches, seven monasteries, and five nunneries, and has 5000 inhabitants, whose chief occupation is making woollen and silk stockings. It is situated on the river Esino, about five miles from the Adriatic Sea, in a district rich in olives, wine, and mulberries.