Etymology
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in situ 
1740, Latin, literally "in its (original) place or position," from ablative of situs "site" (see site (n.)).
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in-store (adj.)
also instore, 1954, from in (prep.) + store (n.). In Middle English, instore was a verb meaning "to restore, renew," from Latin instaurare.
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trade-in (n.)
1917, in reference to used cars, from verbal phrase, from trade (v.) + in (adv.).
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in-patient (n.)
also inpatient, "person lodged and fed, as well as treated, at a hospital or infirmary," 1760, from in (adj.) + patient (n.). As an adjective by 1890.
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in-itselfness (n.)
1879, in philosophy; see in (adv.) + itself + -ness.
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sit-in 
1936, in reference to session musicians; 1937, in reference to union action; 1941, in reference to student protests. From the verbal phrase; see sit (v.) + in (adv.). To sit in is attested from 1868 in the sense "attend, be present;" from 1919 specifically as "attend as an observer."
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stand-in (n.)
"one who substitutes for another," 1928, from the verbal phrase, attested from 1904 in show business slang in the sense "to substitute, to fill the place of another," from stand (v.) + in (adv.).
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in vivo 
1898, Latin; "within a living organism," from vivere "to live" (see vital).
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in extremis 
"at the point of death," 16c., Latin, literally "in the farthest reaches," from ablative plural of extremus "extreme" (see extreme (adj.)).
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in-migration (n.)
1942, American English, in reference to movement within the same country (as distinguished from immigration), from in (prep.) + migration.
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