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philosophy (n.) Look up philosophy at Dictionary.com
c. 1300, "knowledge, body of knowledge," from Old French filosofie "philosophy, knowledge" (12c., Modern French philosophie) and directly from Latin philosophia and from Greek philosophia "love of knowledge, pursuit of wisdom; systematic investigation," from philo- "loving" (see philo-) + sophia "knowledge, wisdom," from sophis "wise, learned;" of unknown origin.
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]
Meaning "system a person forms for conduct of life" is attested from 1771.
philosophize (v.) Look up philosophize at Dictionary.com
1590s, from philosophy + -ize. Related: Philosophized; philosophizing. The earlier verb was simply philosophy (late 14c.).
philosophic (adj.) Look up philosophic at Dictionary.com
late 15c., from Middle French philosophique and directly from Late Latin philosophicus, from Greek philosophikos, from philosophia "philosophy" (see philosophy).
philosophical (adj.) Look up philosophical at Dictionary.com
late 14c.; see philosophy + -ical. Related: Philosophically.
science (n.) Look up science at Dictionary.com
mid-14c., "what is known, knowledge (of something) acquired by study; information;" also "assurance of knowledge, certitude, certainty," from Old French science "knowledge, learning, application; corpus of human knowledge" (12c.), from Latin scientia "knowledge, a knowing; expertness," from sciens (genitive scientis) "intelligent, skilled," present participle of scire "to know," probably originally "to separate one thing from another, to distinguish," related to scindere "to cut, divide," from PIE root *skei- "to cut, to split" (source also of Greek skhizein "to split, rend, cleave," Gothic skaidan, Old English sceadan "to divide, separate;" see schizo-).

From late 14c. in English as "book-learning," also "a particular branch of knowledge or of learning;" also "skillfulness, cleverness; craftiness." From c. 1400 as "experiential knowledge;" also "a skill, handicraft; a trade." From late 14c. as "collective human knowledge" (especially that gained by systematic observation, experiment, and reasoning). Modern (restricted) sense of "body of regular or methodical observations or propositions concerning a particular subject or speculation" is attested from 1725; in 17c.-18c. this concept commonly was called philosophy. Sense of "non-arts studies" is attested from 1670s.
Science, since people must do it, is a socially embedded activity. It progresses by hunch, vision, and intuition. Much of its change through time does not record a closer approach to absolute truth, but the alteration of cultural contexts that influence it so strongly. Facts are not pure and unsullied bits of information; culture also influences what we see and how we see it. Theories, moreover, are not inexorable inductions from facts. The most creative theories are often imaginative visions imposed upon facts; the source of imagination is also strongly cultural. [Stephen Jay Gould, introduction to "The Mismeasure of Man," 1981]

In science you must not talk before you know. In art you must not talk before you do. In literature you must not talk before you think. [John Ruskin, "The Eagle's Nest," 1872]
The distinction is commonly understood as between theoretical truth (Greek episteme) and methods for effecting practical results (tekhne), but science sometimes is used for practical applications and art for applications of skill. To blind (someone) with science "confuse by the use of big words or complex explanations" is attested from 1937, originally noted as a phrase from Australia and New Zealand.
philosopher (n.) Look up philosopher at Dictionary.com
from Old English philosophe, from Latin philosophus "philosopher," from Greek philosophos "philosopher, sage, one who speculates on the nature of things and truth," literally "lover of wisdom," from philos "loving" (see -phile) + sophos "wise, a sage" (see sophist). Modern form with -r appears early 14c., from an Anglo-French or Old French variant of philosophe, with an agent-noun ending.
Pythagoras was the first who called himself philosophos, instead of sophos, 'wise man,' since this latter term was suggestive of immodesty. [Klein]
Philosophy also was used of alchemy in Middle Ages, hence Philosophers' stone (late 14c., translating Medieval Latin lapis philosophorum, early 12c.), a reputed solid substance supposed by alchemists to change baser metals into gold or silver; also identified with the elixir and thus given the attribute of prolonging life indefinitely and curing wounds and disease. (French pierre philosophale, German der Stein der Weisen).
reductionism (n.) Look up reductionism at Dictionary.com
1948, in philosophy, from reduction in specialized sense in philosophy (1914) + -ism. Related: Reductionist.
Ph.D Look up Ph.D at Dictionary.com
attested from 1869; abbreviation of Latin Philosophiae Doctor "Doctor of Philosophy."
relativism (n.) Look up relativism at Dictionary.com
1865, in philosophy, from relative (adj.) + -ism. Compare relativist.
sensationalist Look up sensationalist at Dictionary.com
1846 in philosophy; 1868 of writers; from sensational + -ist. Related: Sensationalistic.
in-itselfness (n.) Look up in-itselfness at Dictionary.com
1879, in philosophy; see in (adv.) + itself + -ness.
indeterminism (n.) Look up indeterminism at Dictionary.com
1874 in philosophy, from in- (1) "not, opposite of" + determinism.
Kantian (adj.) Look up Kantian at Dictionary.com
also Kantean, 1796, of or pertaining to German thinker Immanuel Kant (1724-1804) or his philosophy.
anarchistic (adj.) Look up anarchistic at Dictionary.com
"advocating the political philosophy of anarchism," 1845, from anarchist + -ic. Differentiated from anarchic, which tends to mean "chaotic, lawless." Related: Anarchistically.
Phi Beta Kappa Look up Phi Beta Kappa at Dictionary.com
undergraduate honorary society, 1776, from initials of Greek philosophia biou kybernetes "philosophy, guide of life."
consequentialism (n.) Look up consequentialism at Dictionary.com
1969, from consequential + -ism. The philosophy that the morality of an action is to be judged solely by its consequences. Related: Consequentialist.
cynicism (n.) Look up cynicism at Dictionary.com
1670s, "philosophy of the Cynics," from cynic + -ism. Meaning "cynical character" is from 1847. For nuances of usage of cynicism, see humor (n.).
realist (n.) Look up realist at Dictionary.com
c. 1600, in philosophy, from real (adj.) + -ist, and compare French réaliste. Also see realism.
pragmaticism (n.) Look up pragmaticism at Dictionary.com
1865, "officiousness," from pragmatic + -ism. From 1905 as a term in philosophy by American philosopher C.S. Peirce (1839-1914).
dualism (n.) Look up dualism at Dictionary.com
1755 as a term in philosophy, from French dualisme (1754); also used in theological senses; see dual + -ism.
ethic (n.) Look up ethic at Dictionary.com
late 14c., ethik "study of morals," from Old French etique "ethics, moral philosophy" (13c.), from Late Latin ethica, from Greek ethike philosophia "moral philosophy," fem. of ethikos "ethical," from ethos "moral character," related to ethos "custom" (see ethos). Meaning "moral principles of a person or group" is attested from 1650s.
yang (n.) Look up yang at Dictionary.com
masculine or positive principle in Chinese philosophy, 1670s, from Mandarin yang, said to mean "male, daylight, solar," or "sun, positive, male genitals."
contextual (adj.) Look up contextual at Dictionary.com
c. 1820, from context on model of textual, etc. In philosophy, contextual definition is recorded from 1934, along with contextualization, contextualize. Related: Contextualized.
Cyrene Look up Cyrene at Dictionary.com
ancient Greek colony in Libya; the name is of unknown origin. Cyrenaic referred to the philosophy ("practical hedonism") of Aristippus of Cyrene (c. 435-c. 356 B.C.E.).
sattva (n.) Look up sattva at Dictionary.com
"truth" (in Hindu philosophy), from Sanskrit sattvah "truth," literally "being," cognate with Gothic sunjis, Old English soð "true" (see sooth).
prehension (n.) Look up prehension at Dictionary.com
1530s, "seizure, arrest," from Latin prehensionem (nominative prehensio), noun of action from past participle stem of prehendere (see prehensile). Use in philosophy is from 1925.
impressionism (n.) Look up impressionism at Dictionary.com
1839 as a term in philosophy, from impression + -ism. With reference to the French art movement, 1879, from impressionist. Extended 1880s to music (Debussy), literature, etc.
historicism (n.) Look up historicism at Dictionary.com
1856, translating German historismus (by 1835), from historic + -ism. Given various senses 20c. in theology, philosophy, architecture, etc.
sensationalism (n.) Look up sensationalism at Dictionary.com
1846 in philosophy, "theory that sensation is the only source of knowledge;" 1865, of journalism that aims to excite the feelings, from sensational + -ism.
hedonic (adj.) Look up hedonic at Dictionary.com
"of or relating to pleasure," also, "of or having to do with the Cyrenaic school of philosophy," 1650s, from Greek hedonikos "pleasurable," from hedone "pleasure" (see hedonist).
arete (n.2) Look up arete at Dictionary.com
important concept in Greek philosophy, "rank, nobility, moral virtue, excellence," especially of manly qualities; literally "that which is good," a word of uncertain origin.
yin (n.) Look up yin at Dictionary.com
feminine or negative principle in Chinese philosophy, 1670s, from Chinese (Mandarin) yin, said to mean "female, night, lunar," or "shade, feminine, the moon." Compare yang. Yin-yang is from 1850.
imperative (n.) Look up imperative at Dictionary.com
mid-15c., in grammar; later "something imperative" (c. 1600), from Old French imperatif in the grammatical sense (13c.) and directly from Late Latin imperativus (see imperative (adj.)). In philosophy from 1796.
existential (adj.) Look up existential at Dictionary.com
1690s, "pertaining to existence," from Late Latin existentialis/exsistentialis, from existentia/exsistentia (see existence). As a term in logic, from 1819; in philosophy, from 1937, tracing back to the Danish works of Kierkegaard (see existentialism). Related: Existentially.
naturalism (n.) Look up naturalism at Dictionary.com
1630s, "action based on natural instincts," from natural + -ism. In philosophy, as a view of the world and humanity's relationship to it, from 1750. As a tendency in art and literature, from 1850.
nous (n.) Look up nous at Dictionary.com
slang for "intelligence, common sense," 1706, from Greek nous, Attic form of noos "mind, intellect," which was taken in English in philosophy 1670s.
positivism (n.) Look up positivism at Dictionary.com
1847, the philosophy of Auguste Comte (1798-1857), who published "Philosophie positive" in 1830; see positive (adj.) in the "just the facts" sense + -ism. Related: Positivist; Positivistic.
materialism (n.) Look up materialism at Dictionary.com
1748, "philosophy that nothing exists except matter" (from French matérialisme); 1851 as "a way of life based entirely on consumer goods." From material (n.) + ism.
humanistic (adj.) Look up humanistic at Dictionary.com
1845 (humanistical is from 1716), in reference to Renaissance or classical humanism; from humanist + -ic. From 1904 in reference to a modern philosophy that concerns itself with the interests of the human race.
bionomy (n.) Look up bionomy at Dictionary.com
"science of the laws of life, or of living functions," 1853, in books on Comte's philosophy, from bio- "life" + -nomy, from Greek nomos "law" (from PIE root *nem- "assign, allot; take"). Related: Bionomic.
jurisprudence (n.) Look up jurisprudence at Dictionary.com
1620s, "systematic knowledge of law," from French jurisprudence (17c.) and directly from Late Latin iurisprudentia "the science of law," from iuris "of right, of law" (genitive of ius; see jurist) + prudentia "knowledge, a foreseeing" (see prudence). Meaning "the philosophy of law" is first attested 1756. Related: Jurisprudent; jurisprudential.
Esalen Look up Esalen at Dictionary.com
1966 in reference to an alternative philosophy and human potential movement, from Esalen Institute in Big Sur, California, U.S., from Esselen, name of an extinct Native American people of the California coast, for which Bright gives no etymology.
voluntarism (n.) Look up voluntarism at Dictionary.com
1838, "theory or principal of using voluntary action rather than coercion (in politics, religion, etc.), from voluntary + -ism. (Voluntaryism in the religious sense, as opposed to establishmentarianism, is recorded from 1835.) In philosophy, "theory that the will is the basic principle," 1896, from German Voluntarismus (Tönnies, 1883).
activist (n.) Look up activist at Dictionary.com
"one who advocates a doctrine of direct action" in any sense, 1915; from active + -ist. Originally in reference to a political movement in Sweden advocating abandonment of neutrality in World War I and active support for the Central Powers. The word was used earlier in philosophy (1907).
individualism (n.) Look up individualism at Dictionary.com
"quality of being distinct or individual, individuality," 1815, from individual + -ism. As the name of a social philosophy favoring non-interference of government in lives of individuals (opposed to communism and socialism) first attested 1851 in writings of J.S. Mill.
categorical (adj.) Look up categorical at Dictionary.com
1590s, as a term in logic, "unqualified, asserting absolutely," from Late Latin categoricus, from Greek kategorikos "accusatory, affirmative, categorical," from kategoria (see category). General sense of "explicit, unconditional" is from 1610s. Categorical imperative, from the philosophy of Kant, first recorded 1827. Related: Categorically.
modification (n.) Look up modification at Dictionary.com
c. 1500, in philosophy, from Middle French modification (14c.) and directly from Latin modificationem (nominative modificatio) "a measuring," noun of action from past participle stem of modificare (see modify). Meaning "alteration to an object to bring it up to date" is from 1774. Biological sense is attested by 1896.
formalism (n.) Look up formalism at Dictionary.com
1840, "strict adherence to prescribed forms," from formal + -ism. Used over the years in philosophy, theology, literature, and art in various senses suggesting detachment of form from content, or spirituality, or meaning; or belief in the sufficiency of formal logic. Related: Formalist.
intellectualism (n.) Look up intellectualism at Dictionary.com
1818, in philosophy, "belief in the supremacy of the intellect," probably based on German Intellektualismus (said by Klein to have been coined 1803 by Friedrich Wilhelm Joseph von Schelling (1775-1854) from Late Latin intellectualis); see intellectual + -ism. Meaning "devotion to intellectuality" also is from 1818.
Hobbesian (adj.) Look up Hobbesian at Dictionary.com
1776, of or resembling the writings of English thinker Thomas Hobbes (1588-1679), whose works on political philosophy have a reputation for their bleak outlook on the world. The surname is from Hob. The earlier adjective was Hobbian (1680s).