A school of philosophy in Greece, founded by Xenophanes of Elia, and of which Parmenides and Zeno, both of Elia, were the leading adherents and advocates, the former developing the system and the latter completing it, the ground-principle of which was twofold—the affirmation of the unity, and the negative of the diversity, of being—in other words, the affirmation of pure being as alone real, to the exclusion of everything finite and merely phenomenal. See "Sartor," Bk. I. chap. 8.