Etymology
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in absentia (adv.)

Latin, literally "in (his/her/their) absence" (see absence). By 1831 in English, earlier in legal Latin.

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in-house (adj.)

also inhouse, 1955, from in (prep.) + house (n.).

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shut-in (n.)

"person confined from normal social intercourse," 1904, from the verbal phrase (attested by late 14c. as "lock (someone) in (some place);" from shut (v.) + in (adv.). As an adjective, shut-in "enclosed, hemmed in" is attested by 1849, especially of persons, "isolated and confined by disability, etc."

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tie-in (n.)

"connection," 1934, from verbal phrase (attested by 1793), from tie (v.) + in (adv.).

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in re (prep.)

"in the matter of, in the (legal) case of," c. 1600, probably from Duns Scotus; Latin, from re, ablative of res "property, goods; matter, thing, affair," from Proto-Italic *re-, from PIE *reh-i- "wealth, goods" (source also of Sanskrit rayi- "property, goods," Avestan raii-i- "wealth").

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in-gather (v.)

also ingather, 1570s, from in (adv.) + gather (v.). Related: Ingathered; ingathering (1530s).

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lead-in (n.)

1913, in electrical wiring, from verbal phrase; see lead (v.1) + in (adv.). General sense of "introduction, opening" is from 1928, originally in music.

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in-service (adj.)

also inservice, 1928, from in (prep.) + service (n.).

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in vitro 

1892, scientific Latin; "in a test tube, culture dish, etc.;" literally "in glass," from Latin vitrum "glass" (see vitreous).

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drive-in (adj.)

in reference to of restaurants, banks, etc., built to be patronized without leaving one's car, 1929, from the verbal phrase; see drive (v.) + in (adv.). Of movie theaters by 1933 (the year the first one opened, in Camden, New Jersey).

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