From Aristotle to Zoroastrianism, a complete reference for the student of philosophy as well as the layman. Offers concise definitions of thousands of concepts and brief biographies of thinkers and philosophers. Covers more than 3000 years of world philosophy. This classic resource, available now for the first time in more than twenty years, is both a pleasure for interested browsers and an invaluable learning tool for students just beginning the study of philosophy.