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discotheque (n.)[discotheque 词源字典]: 1954 as a French word in English; nativized by 1965, from French discothèque "nightclub with recorded music for dancing," also "record library," borrowed 1932 from Italian discoteca "record collection, record library," coined 1927 from disco "phonograph record" + -teca "collection," probably on model of biblioteca "library."[discotheque etymology, discotheque origin, 英语词源]
discount (n.): 1620s, "abatement," alteration of 16c. French descompte, from Medieval Latin discomputus (source of Italian disconto), from discomputare (see discount (v.)). Meaning "deduction for early payment" is from 1680s; meaning "reduction in the price of goods" attested by 1837.
discount (v.): 1620s, "reckon as an abatement or deduction," from Old French desconter (13c., Modern French décompter), from Medieval Latin discomputare, from dis- (see dis-) + computare "to count" (see count (v.)). Hence, "to abate, deduct" (1650s), and figurative sense "to leave out of account, disregard" (1702). Related: Discounted; discounting.
discountenance (v.): "put to shame," 1570s, from Middle French descontenancer (16c.) "to abash," from des- (see dis-) + contenancer (see countenance).
discourage (v.): mid-15c., discoragen, from Middle French descourager, from Old French descoragier, from des- "away" (see dis-) + corage (see courage). Related: Discouraged; discouragement; discouraging.
discourse (n.): late 14c., "process of understanding, reasoning, thought," from French discours, from Latin discursus "a running about," in Late Latin "conversation," from past participle stem of discurrere "run about," from dis- "apart" (see dis-) + currere "to run" (see current (adj.)). Sense of "formal speech or writing" is first recorded 1580s.
discourse (v.): 1540s, from discourse (n.). Related: Discoursed; discoursing.
discourteous (adj.): 1560s; see dis- + courteous. Related: Discourteously.
discourtesy (n.): 1550s; see dis- "opposite of" + courtesy.
discover (v.): c. 1300, "divulge, reveal, disclose," from Old French descovrir "uncover, unroof, unveil, reveal, betray," from Late Latin discooperire, from Latin dis- "opposite of" (see dis-) + cooperire "to cover up" (see cover). At first with a sense of betrayal or malicious exposure (discoverer originally meant "informant"); the meaning "to obtain knowledge or sight of what was not known" is from 1550s. Related: Discovered; discovering.
discovery (n.): 1550s, "fact of discovering;" see discover + -y (1). Earlier in this sense was discovering (mid-14c.). Meaning "that which is discovered" is from 1630s.
discredit (v.): 1550s, from dis- "opposite of" + credit (v.). Related: Discredited; discrediting; discreditable; discreditably.
discreet (adj.): mid-14c., "morally discerning, prudent, circumspect," from Old French discret "discreet, sensible, intelligent, wise," from Latin discretus "separated, distinct," in Medieval Latin "discerning, careful," past participle of discernere "distinguish" (see discern). Meaning "separate, distinct" in English is late 14c.

Spellings discrete and nativized discreet co-existed until after c. 1600, when discreet became the common word for "careful, prudent," and discrete was maintained in philosophy, medicine, music and other disciplines that remembered Latin and made effort to obey it. Related: Discreetly.
discrepancy (n.): mid-15c. (discrepance), from Latin discrepantia "discordance, discrepancy," from discrepantem (nominative discrepans), present participle of discrepare "sound differently, differ," from dis- "apart, off" (see dis-) + crepare "to rattle, crack" (see raven). Related: Discrepancies.
discrete (adj.): late 14c., see discreet. Related: Discretely.
discretion (n.): c. 1300, dyscrecyun, "moral discernment," from Old French discrecion or directly from Late Latin discretionem (nominative discretio) "discernment, power to make distinctions," in classical Latin "separation, distinction," noun of state from past participle stem of discernere "to separate, distinguish" (see discern). Phrase at (one's) discretion attested from 1570s, from sense of "power to decide or judge" (late 14c.); the age of discretion (late 14c.) in English law was 14.
discretionary (adj.): 1680s (implied in discretionarily); see discretion + -ary.
discriminate (v.): 1620s, from Latin discriminatus, past participle of discriminare "to divide, separate," from discrimen (genitive discriminis) "interval, distinction, difference," derived noun from discernere (see discern). The adverse (usually racial) sense is first recorded 1866, American English. Positive sense remains in discriminating. Related: Discriminated. Also used 17c. and after as an adjective meaning "distinct."
discriminating (adj.): "possessing discernment," 1792, present participle adjective from discriminate (v.).
discrimination (n.): 1640s, "the making of distinctions," from Late Latin discriminationem (nominative discriminatio), noun of action from past participle stem of discriminare (see discriminate). Especially in a prejudicial way, based on race, 1866, American English. Meaning "discernment" is from 1814.
It especially annoys me when racists are accused of 'discrimination.' The ability to discriminate is a precious facility; by judging all members of one 'race' to be the same, the racist precisely shows himself incapable of discrimination. [Christopher Hitchens]