Etymology
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metaphysics (n.)

"the science of the inward and essential nature of things," 1560s, plural of Middle English metaphisik, methaphesik (late 14c.), "branch of speculation which deals with the first causes of things," from Medieval Latin metaphysica, neuter plural of Medieval Greek (ta) metaphysika, from Greek ta meta ta physika "the (works) after the Physics," title of the 13 treatises which traditionally were arranged after those on physics and natural sciences in Aristotle's writings. See meta- + physics.  

The name was given c.70 B.C.E. by Andronicus of Rhodes, and was a reference to the customary ordering of the books, but it was misinterpreted by Latin writers as meaning "the science of what is beyond the physical." The word originally was used in English in the singular; the plural form predominated after 17c., but singular made a comeback late 19c. in certain usages under German influence. From 17c. also sometimes "philosophy in general," especially "the philosophical study of the mind, psychology."

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metaphysic (n.)

late 14c., metaphisik, metafisik, "metaphysics," also "natural theology," from Old French metafisique and directly from Medieval Latin metaphysica (see metaphysics). This was the usual form of metaphysics until 16c.; it was somewhat revived 19c. under German influence.

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metamathematics (n.)

"the metaphysics of mathematics," including the philosophy of non-Euclidian geometry, 1878, from meta- in the sense of "transcending, overarching, dealing with the most fundamental matters of" + mathematics. Related: Metamathematical.

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metaphysical (adj.)

early 15c., metaphisicalle, "pertaining to metaphysics," from methaphesik (late 14c.) + -al, and in part from Medieval Latin metaphysicalis, from Medieval Latin metaphysica (see metaphysics). It came to be used more loosely in the sense of "abstract, speculative, apart from ordinary or practical modes of thought" (among others by Samuel Johnson, who applied it to certain 17c. poets, notably Donne and Cowley, who used "witty conceits" and abstruse imagery), and often had more or less a depreciative sense. Related: Metaphysically.

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egoist (n.)
1763, in metaphysics, "one who maintains there is no evidence of the existence of anything but the self" (taking ego in a sense of "thinking subject"), from French égoiste (1755); see ego + -ist. Meaning "selfish person" is from 1879. Related: Egoistic; egoistical.
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metapolitics (n.)

1784, "abstract political science; purely speculative treatment of politics, unrelated to practical matters;" see meta- "transcending, overarching, dealing with the most fundamental matters of" + politics. Based on metaphysics. Related: Metapolitical, which is attested from 1670s in the sense of "outside the realm of politics."

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metaphysician (n.)

"one versed in the science of metaphysics," mid-15c., perhaps from Old French methafisicien (14c., Modern French métaphysicien), or from metaphysic on the model of physician. In later colloquial use "one who practices the mind-cure," 1881.

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psychic (adj.)

1872, "of or pertaining to the human soul" (earlier psychical, 1640s), from Greek psykhikos "of the soul, spirit, or mind" (opposed to somatikos), also (New Testament) "concerned with the life only, animal, natural," from psykhē "soul, mind, life" (see psyche).

The meaning "characterized by psychic gifts; pertaining to the class of extraordinary and obscure phenomena of the mind not usually treated by psychologists" (mind-reading, second sight, etc.) is attested from 1871.

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absolutist (n.)
Origin and meaning of absolutist
1830 in political science, "advocate of despotism" (Thompson), from absolute + -ist on model of French absolutiste (by 1820). From 1835 as an adjective. Compare absolutism. Used in a different sense in metaphysics by the followers of Fichte, Schelling and Hegel.
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egoism (n.)
1785, in metaphysics, "the theory that a person has no proof that anything exists outside his own mind," from French égoisme (1755), from Modern Latin egoismus, from Latin ego (see ego). Meaning "doing or seeking of that which affords pleasure or advances interest" is from 1800; opposed to altruism, but not necessarily "selfish." Meaning "self-centeredness" is from 1840. Between egoism and egotism, egoism is more correctly formed; there formerly was a useful distinction, with egotism tending to take the senses "self-centeredness" and "extensive use of 'I'" and leaving to egoism the theoretical sense in metaphysics and ethics.
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