1 the theoretical philosophy of being and knowing.
2 the philosophy of mind.
3 colloq. abstract or subtle talk; mere theory.
Derivatives:
metaphysician n. metaphysicize v.intr.
Etymology: ME metaphysic f. OF metaphysique f. med.L metaphysica ult. f. Gk ta meta ta phusika the things after the Physics, from the sequence of Aristotle's works
Useful english dictionary. 2012.