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in-between (n.)

1815, "an interval;" also "a person who intervenes," noun use of prepositional phrase, from in (adv.) + between. Related: In-betweener (1912); in-betweenity (1927).

in utero

1713, Latin, literally "in the uterus," from ablative of uterus (see uterus).

in memoriam

Latin, literally "in memory of," from accusative of memoria "memory" (from PIE root *(s)mer- (1) "to remember"). The phrase was much-used in Latin writing; Tennyson's poem of that name (published in 1850) seems to have introduced the phrase to English.

in absentia (adv.)

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

in-house (adj.)

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

in vitro

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

in-service (adj.)

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

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).

hang in (v.)

"persist through adversity," 1969, usually with there; see hang (v.) + in (adv.).

in-going (adj.)

also ingoing, 1825, from in + going. Probably a modern formation unrelated to Middle English in-going (n.) "act of entering" (mid-14c.), from ingo "to go in, enter," from Old English ingan (past tense ineode), equivalent of German eingehen, Dutch ingaan.

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