1
a. Of, belonging to, or of the nature of metaphysics; such as is recognized by metaphysics. Also more generally: transcendental, philosophical.
b. depreciative. Of reasoning, ideas, etc.: excessively subtle or abstract.
c. Based on abstract general reasoning; determined a priori or on theoretical principles.
d. Philos. In the philosophy of Wittgenstein and the logical positivists: (of an entity or proposition) not empirically verifiable.
2. Of persons or their attributes: having an inclination towards or interest in metaphysics; suited to the study of metaphysics.
3
a. Literary Criticism.
b. Fine Art.
Other senses relating more generally to things which are immaterial, imaginary, preternatural, or supernatural.
4
a. Designating that which is immaterial, incorporeal, or supersensible (esp. in explicit contrast to physical).
b. Surpassing what is natural or ordinary; extraordinary, transcendent
c. That is above or goes beyond the laws of nature; belonging to an operation or agency which is more than or other than physical or natural; supernatural.
d. Christian Science. Designating a healer who uses non-physical means to cure physical illnesses; also applied to such methods of healing.
5. Fanciful, fantastic, imaginary
Definitions of metaphysical courtesy of OED