A modern dictionary of Catholic terms, both common and obscure. Find accurate definitions of words and phrases.
God as the ultimate cause of all motion or change in the universe, himself remaining unchanged. The term used by Aristotle and later by St. Thomas Aquinas, i.e., motor immobile, where motor means the one who changes, and immobile is unchangeable.
All items in this dictionary are from Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.