n.pl. (usu. treated as sing.) 1 the theoretical philosophy of being and knowing. 2 the philosophy of mind. 3 colloq. abstract or subtle talk; mere theory. metaphysician n. metaphysicize v.intr.
[ 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 ]