Etymology
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diaphragm (n.)

late 14c., diafragma, in anatomy, "muscular membrane which separates the thorax from the abdominal cavity in mammals," from Late Latin diaphragma, from Greek diaphragma "partition, barrier, muscle which divides the thorax from the abdomen," from diaphrassein "to barricade," from dia "across" (see dia-) + phrassein "to fence or hedge in," which is of uncertain etymology. Beekes suggests it is a substrate word and finds "no convincing correspondence outside Greek."

The native word in the anatomical sense is midriff. From 1650s as "a partition" of any kind, "something which divides or separates;" 1660s in the special sense "thin piece of metal" serving some purpose (as a sound resonator, etc.). Meaning "contraceptive cap" is from 1933. Related: Diaphragmal; diaphragmatic.

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perfecta (n.)

method of betting in which the bettor must pick the first- and second-place finishers in correct order, 1971, from American Spanish perfecta, shortened from quiniela perfecta "perfect quiniela," a bet in horseracing (see quinella); for perfecta, see perfect (adj.).

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-nomy 

word-forming element, principally in the science, forming names of disciplines describing natural laws or scientific methods; from Greek -nomia "method," -nomos "managing," nomos "law, usage, custom," all from the verb nemein "to manage," from PIE root *nem- "assign, allot; take." 

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computation (n.)

c. 1400, "act, process, or method of arithmetical calculation," from Latin computationem (nominative computatio), noun of action from past participle stem of computare "to sum up, reckon, compute," from com "with, together" (see com-) + putare "to reckon," originally "to prune," from PIE root *pau- (2) "to cut, strike, stamp." From 1713 as "a result of computation, amount reckoned."

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gyromancy (n.)

1550s, method of divination said to have been practiced by a person walking in a circle marked with characters or signs till he fell from dizziness, the inference being drawn from the place in the circle at which he fell; from Medieval Latin gyromantia, from Greek gyyros "circle" (see gyro- (n.)) + manteia "divination, oracle" (see -mancy).

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acupressure (n.)

1859, name of a method (developed by J.Y. Simpson) of stopping surgical bleeding by pinning or wiring the artery shut, from Latin acus "a needle" (from PIE root *ak- "be sharp, rise (out) to a point, pierce") + pressure (n.). From 1958 in reference to the oriental body therapy also known as shiatsu (said to mean literally "finger-pressure" in Japanese).

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dispensation (n.)
Origin and meaning of dispensation

late 14c., dispensacioun, "power to dispose of," also "act of dispensing or dealing out," also "a relaxation of the law in some particular case," from Old French despensacion (12c., Modern French dispensation) and directly from Latin dispensationem (nominative dispensatio) "management, charge," noun of action from past-participle stem of dispensare "disburse, administer, distribute (by weight)" (see dispense). Related: Dispensational.

Theological sense "method or scheme by which God has developed his purposes and revealed himself to man" (late 14c.) is from the use of the Latin word to translate Greek oikonomoia "office, method of administration" (see economy). Hence "particular period during which a religious system has prevailed" (1640s), with Patriarchal, Mosaic, Christian, etc. Also "a particular distribution (for good or ill) by divine providence" (1650s).

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manner (n.)

c. 1200, manere, "kind, sort, variety," from Anglo-French manere, Old French maniere "fashion, method, manner, way; appearance, bearing; custom" (12c., Modern French manière), from Vulgar Latin *manaria (source of Spanish manera, Portuguese maneira, Italian maniera), from fem. of Latin manuarius "belonging to the hand," from manus "hand" (from PIE root *man- (2) "hand"). The French word also was borrowed by Dutch (manier), German (manier), Swedish (maner).

Meaning "customary practice" is from c. 1300. Senses of "way of doing something; a personal habit or way of doing; way of conducting oneself toward others" are from c. 1300. Meaning "specific nature, form, way something happens" is mid-14c.

Of literature, art, etc., "way in which a work is made or executed," from 1660s. Most figurative meanings derive from the original sense "method of handling" which was extended when the word was used to translate Latin modus "method."

Phrase manner of speaking is recorded from 1530s. To the manner born ("Hamlet" I iv.15) sometimes is used incorrectly; it means "accustomed by birth to be subject to the practice," but the noun is sometimes understood as manor (which formerly also was spelled manner).

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Coulomb (n.)

"unit of quantity in measuring electric current" (the quantity of electricity conveyed in 1 second by a current of 1 ampere, 1881, named for French chemist Charles-Augustin de Coulomb (1736-1806), who devised a method of measuring electrical quantity. The surname is a French form of Columbus.

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numeration (n.)

early 15c., numeracioun, "method or process of numbering or calculating," from Latin numerationem (nominative numeratio) "a counting out, paying, payment," noun of action from past-participle stem of numerare "to count, number," from numerus "number" (see number (n.)). Meaning "act or process of counting the number of" is from mid-15c.

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