Etymology
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distributor (n.)

1520s, distributer (Latinized form is from 1570s), "one who or that which distributes," agent noun from Latin distribuere "to divide, deal out in portions" (see distribute). As a part that passes current in turn to each spark plug in an internal combustion engine, by 1866.

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clandestine (adj.)

"secret, private, hidden, furtive," 1560s, from Latin clandestinus "secret, hidden," from clam "secretly," from adverbial derivative of base of celare "to hide" (from PIE root *kel- (1) "to cover, conceal, save"), perhaps on model of intestinus "internal." Related: Clandestinely. As a noun form, there is awkward clandestinity (clandestineness apparently being a dictionary word).

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intestines (n.)
"bowels," 1590s, from intestine, based on Latin intestina, neuter plural of intestinus (adj.) "internal, inward, intestine," from intus "within, on the inside," from PIE *entos, suffixed form of root *en "in" (see in (adv.)). Compare Sanskrit antastyam, Greek entosthia "bowels." The Old English word was hropp, literally "rope."
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manifold (n.)

in mechanical sense, "pipe or chamber, usually of cast metal, with several outlets," by 1855, a shortening of manifold pipe (by 1845), which originally was used with reference to a type of musical instrument mentioned in the Old Testament. See manifold (adj.). As "pipe running from a carburetor to the cylinders in an internal combustion engine of an automobile," by 1904.

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ignition (n.)

1610s, "act of heating to the point of combustion," from French ignition or directly from Medieval Latin ignitionem (nominative ignitio), noun of action from past-participle stem of Latin ignire "set on fire," from ignis "fire" (see igneous). Meaning "means of sparking a fire" (originally in a gun) is from 1881; meaning "means of sparking an internal combustion engine" is from 1906.

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misfire (v.)

1752, of a gun, "to fail in firing;" by 1893 of an internal combustion engine; see mis- (1) "badly, wrongly" + fire (v.). Perhaps the first element is miss (v.); to miss fire, of a gun, is attested by 1727. Related: Misfired; misfiring. Figurative use by 1942. The noun is attested from 1839 in reference to a gun or cannon.

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inward (adj.)
Old English inweard "inmost; sincere; internal, intrinsic; deep," from Proto-Germanic *inwarth "inward" (source also of Old Norse innanverðr, Old High German inwart, Middle Dutch inwaert), from root of Old English inne "in" (see in (adv.)) + -weard (see -ward). As an adverb, Old English inneweard. As a noun in late Old English, "entrails, intestines."
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enmity (n.)
late 14c., "hostile feeling, rivalry, malice; internal conflict," from Old French enemite, variant of enemistié "enmity, hostile act, aversion" (Modern French inimité), from Vulgar Latin *inimicitatem (nominative *inimicitas), from Latin inimicitia "enmity, hostility," usually plural, from inimicus "enemy" (see enemy). Related: Enmities. Amity is basically the same word without the negative prefix.
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common sense (n.)

late 14c., originally an internal mental power supposed to unite (reduce to a common perception) the impressions conveyed by the five physical senses (Latin sensus communis, Greek koine aisthesis). Thus "ordinary understanding, without which one is foolish or insane" (1530s); the meaning "good sense" is from 1726. Also, as an adjective, common-sense "characterized by common sense" (1854).

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apperceive (v.)
c. 1300, "to perceive, notice," especially of internal observation (a sense now obsolete), from Old French apercevoir "perceive, notice, become aware of" (11c.), from Latin ad "to" (see ad-) + percipere "gather, seize entirely," also, figuratively, "to grasp with the mind, learn, comprehend" (see perceive. In modern psychological use (1876), a back-formation from apperception (q.v.). Related: Apperceived; apperceiving; apperceptive.
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