(Gk “that which stands under,” i.e., the real nature or essence of anything; pl. hypostases) a Greek philosophical term, meaning both “essential being” or what defines a thing as a member of a class of things and “individual being” or what a thing is in itself. It was used by, among others, the neoplatonist mystics. It refers to the three constitutive orders of reality, the One, Mind, and Soul, each of which is an hypostasis. See “The Bible in the Jewish Mystical Tradition” (pp. 1976–90).