Etymology
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philosophy (n.)
Origin and meaning of philosophy

c. 1300, philosophie, "knowledge, learning, scholarship, scholarly works, body of knowledge," from Old French filosofie "philosophy, knowledge" (12c., Modern French philosophie) and directly from Latin philosophia, from Greek philosophia "love of knowledge, pursuit of wisdom; systematic investigation," from philo- "loving" (see philo-) + sophia "knowledge, wisdom," from sophis "wise, learned;" a word of unknown origin [Beekes]. With many spelling variants in Middle English (filozofie, phelosophie, etc.).

From mid-14c. as "the discipline of dealing in rational speculation or contemplation;" from late 14c. as "natural science," also "alchemy, occult knowledge;" in the Middle Ages the word was understood to embrace all speculative sciences. Meaning "system a person forms for conduct of life" is attested from 1771. The modern sense of "the body of highest truth, the science of the most fundamental matters" is from 1794.

Nec quicquam aliud est philosophia, si interpretari velis, praeter studium sapientiae; sapientia autem est rerum divinarum et humanarum causarumque quibus eae res continentur scientia. [Cicero, "De Officiis"]
[Philosophical problems] are, of course, not empirical problems; but they are solved through an insight into the workings of our language, and that in such a way that these workings are recognized — despite an urge to misunderstand them. The problems are solved, not through the contribution of new knowledge, rather through the arrangement of things long familiar. Philosophy is a struggle against the bewitchment (Verhexung) of our understanding by the resources of our language. [Ludwig Wittgenstein, "Philosophical Investigations," 1953]
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philosophaster (n.)

"pretender to philosophical knowledge," 1610s, from philosophy + -aster.

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philosophical (adj.)

late 14c., "learned, skilled in learning;" c. 1500 as "related or belonging to philosophy or philosophers;" see philosophy + -ical. Related: Philosophically.

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philosophist (n.)

"a would-be philosopher," a disparaging term for a rationalist or skeptic, a philosophe; 1798, from French philosophiste; see philosophy + -ist.

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philosophic (adj.)

"pertaining to philosophy," mid-15c., philosophik, from Old French filosofique (Modern French philosophique) and directly from Late Latin philosophicus, from Greek philosophikos, from philosophia "philosophy" (see philosophy).

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philosophize (v.)

"to think and reason about the subjects of philosophy; to meditate upon the fundamental principles of being or knowledge," 1590s, from philosophy + -ize. Related: Philosophized; philosophizing. The earlier verb was simply philosophy (late 14c., philosophien).

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reductionism (n.)
1948, in philosophy, from reduction in specialized sense in philosophy (1914) + -ism. Related: Reductionist.
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Ph.D 
attested from 1869; abbreviation of Latin Philosophiae Doctor "Doctor of Philosophy."
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sensationalist 
1846 in philosophy; 1868 of writers; from sensational + -ist. Related: Sensationalistic.
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deterministic (adj.)

"pertaining with or imbued with the philosophy of determinism," 1845, from determinist (see determinism) + -ic.

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