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Metaphysics is one of the principal works of Aristotle and the first major work of the branch of philosophy with the same name.
Metaphysics is customarily divided into ontology, which deals with the question of how many fundamentally distinct sorts of entities compose the universe, and metaphysics proper, which is concerned with describing the most general traits of reality.
Before the time of the GermanphilosopherImmanuel Kantmetaphysics was characterized by a tendency to construct theories on the basis of a priori knowledge, that is, knowledge derived from reason alone, in contradistinction to a posteriori knowledge, which is gained by reference to the facts of experience.
Metaphysics (Greek words meta=after/beyond and physics=nature) is a branch of philosophy, and related to the natural sciences, like physics, psychology and the biology of the brain; and also to mysticism, religion, and other spiritual subjects.