This bestselling dictionary is written by one of the leading philosophers of our time, and is widely recognized as the best dictionary of its kind. Comprehensive and authoritative, it covers every aspect of philosophy from Aristotle to Zen. With clear and concise definitions, it provides lively and accessible coverage of not only Western philosophical traditions, but also themes from Chinese, Indian, Islamic, and Jewish philosophy. It is the ideal introduction to philosophy, and is indispensable for students and teachers.