Metaphysics
Metaphysics is the area of philosophy which deals with the ultimate nature of reality: mind, matter and its attributes, the concrete and the abstract, as well as the nature of truth. Metaphysics can emcompass large areas of philosophy, and most other philosophical schools turn back to it for basic definition.
In that respect, the term metaphysics is a broad one, encompassing the philosophical ideas of theology and cosmology, and its primary area: ontology. Most of the structure of metaphysical systems are derived from the models of Aristotle's Metaphysics.
Related: