Babylon UK /ˈbæb.ɪ.lɒn/US /ˈbæb.ɪ.lɑn/ noun1 •(historical) An ancient city, the ancient capital of Babylonia in modern Iraq, built on the banks of the Euphrates.Standing afarre off for the feare of her torment, saying, Alas, alas, that great citie Babylon, that mighty citie: for in one houre is thy iudgement come. — 1611