Etymology
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substitution (n.)

late 14c., substitucion, "appointment of a subordinate or successor," from Old French substitucion, substitution or directly from Late Latin substitutionem (nominative substitutio) "a putting in place of (another)," noun of action from past-participle stem of Latin substituere "put in place of another, place under or next to, present, submit," from sub "under" (see sub-) + statuere "set up" (from PIE root *sta- "to stand, make or be firm," with derivatives meaning "place or thing that is standing").

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substitute (v.)

early 15c. (transitive), from Latin substitutus, past participle of substituere "put in place of another" (see substitution). Transitive use is from 1888. Related: Substituted; substituting.

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substitute (n.)

"one who acts in place of another," early 15c., from Old French substitut (noun use) and directly from Latin substitutus, past participle of substituere "put in place of another" (see substitution). Military draft sense is from 1777, American English. Team sports sense is from 1849. Of foodstuffs, from 1879. As an adjective from early 15c.

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*sta- 

*stā-, Proto-Indo-European root meaning "to stand, set down, make or be firm," with derivatives meaning "place or thing that is standing."

It forms all or part of: Afghanistan; Anastasia; apostasy; apostate; armistice; arrest; assist; astatic; astatine; Baluchistan; bedstead; circumstance; consist; constable; constant; constitute; contrast; cost; desist; destination; destine; destitute; diastase; distance; distant; ecstasy; epistasis; epistemology; establish; estaminet; estate; etagere; existence; extant; Hindustan; histidine; histo-; histogram; histology; histone; hypostasis; insist; instant; instauration; institute; interstice; isostasy; isostatic; Kazakhstan; metastasis; obstacle; obstetric; obstinate; oust; Pakistan; peristyle; persist; post (n.1) "timber set upright;" press (v.2) "force into service;" presto; prostate; prostitute; resist; rest (v.2) "to be left, remain;" restitution; restive; restore; shtetl; solstice; stable (adj.) "secure against falling;" stable (n.) "building for domestic animals;" stage; stalag; stalwart; stamen; -stan; stance; stanchion; stand; standard; stanza; stapes; starboard; stare decisis; stasis; -stat; stat; state (n.1) "circumstances, conditions;" stater; static; station; statistics; stator; statue; stature; status; statute; staunch; (adj.) "strong, substantial;" stay (v.1) "come to a halt, remain in place;" stay (n.2) "strong rope which supports a ship's mast;" stead; steed; steer (n.) "male beef cattle;" steer (v.) "guide the course of a vehicle;" stem (n.) "trunk of a plant;" stern (n.) "hind part of a ship;" stet; stoa; stoic; stool; store; stound; stow; stud (n.1) "nailhead, knob;" stud (n.2) "horse kept for breeding;" stylite; subsist; substance; substitute; substitution; superstition; system; Taurus; understand.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit tisthati "stands;" Avestan histaiti "to stand;" Persian -stan "country," literally "where one stands;" Greek histēmi "put, place, cause to stand; weigh," stasis "a standing still," statos "placed," stylos "pillar;" Latin sistere "stand still, stop, make stand, place, produce in court," status "manner, position, condition, attitude," stare "to stand," statio "station, post;" Lithuanian stojuos "I place myself," statau "I place;" Old Church Slavonic staja "place myself," stanu "position;" Gothic standan, Old English standan "to stand," stede "place;" Old Norse steði "anvil;" Old Irish sessam "the act of standing."

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shogun (n.)

1610s, "hereditary commander of a Japanese army," from Japanese (sei-i-tai) shogun "(barbarian-subduing) chief" (late 12c.), sound-substitution for Chinese chiang chiin, literally "lead army."

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tootsy (n.)

also tootsie, 1854, baby-talk substitution for foot (n.). Candy bar Tootsie Roll patent claims use from 1908.

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Jehosaphat 

biblical name (II Samuel viii.16), used as a mild expletive in American English from 1857; presumably another euphemistic substitution for Jesus.

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adulteress (n.)

also adultress, "woman guilty of adultery," an early 17c. substitution for earlier avoutresse (late 14c.), agent noun in fem. form from obsolete verb adulter "commit adultery" (see adulterer), with fem. ending -ess.

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disprove (v.)

"prove to be false or erroneous," late 14c., from Old French desprover "refute, contradict," from des- (see dis-) + prover "show; convince; put to the test" (see prove). Related: Disproved; disproving; disprovable. Middle English had also dispreven, from Old French desprover, with substitution of prefix.

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do (n.2)

first (and last) note of the diatonic scale, by 1754, from do, used as a substitution for ut (see gamut) for sonority's sake, first in Italy and Germany. U.S. slang do-re-mi "money" is from 1920s, probably a pun on dough in its slang sense of "cash."

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