noun (functioning as singular)1. the branch of philosophy that deals with first principles, esp of being and knowing
2. the philosophical study of the nature of reality, concerned with such questions as the existence of God, the external world, etc
3. descriptive metaphysics
4. (popularly) abstract or subtle discussion or reasoning
Word origin
C16: from Medieval Latin, from Greek
ta meta ta phusika the things after the physics, from the arrangement of the subjects treated in theworks of Aristotle