metaphysics /mɛtəˈfɪzɪks /
▸ plural noun [usually treated as singular] the branch of philosophy that deals with the first principles of things, including abstract concepts such as being, knowing, identity, time, and space:
they would regard the question of the initial conditions for the universe as belonging to the realm of metaphysics or religion.
▪ abstract theory with no basis in reality:
his concept of society as an organic entity is, for market liberals, simply metaphysics.
Metaphysics has two main strands: that which holds that what exists lies beyond experience (as argued by Plato), and that which holds that objects of experience constitute the only reality (as argued by Kant, the logical positivists, and Hume).
metaphysician /mɛtəfɪˈzɪʃ(ə)n / noun
metaphysicize /-ˈfɪzɪsʌɪz/ (also metaphysicise) verb
– ORIGIN mid 16th century : representing medieval Latin metaphysica (neuter plural), based on Greek ta meta ta phusika ‘the things after the Physics’, referring to the sequence of Aristotle’s works: the title came to denote the branch of study treated in the books, later interpreted as meaning ‘the science of things transcending what is physical or natural’.