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Old English innung "a taking in, a putting in," gerundive of innian "get within, put or bring in," from inn (adv.) "in" (see in). Meaning "a team's turn in a game" first recorded 1735, usually plural in cricket, singular in baseball.
Old English in (prep.) "in, into, upon, on, at, among; about, during;" inne (adv.) "within, inside," from Proto-Germanic *in (cf. Old Frisian, Dutch, German, Gothic in, Old Norse i), from PIE *en "in" (cf. Greek en, Latin in "in, into," Old Irish in, Welsh yn-, Old Church Slavonic on-). As an adjective from 1590s.
The forms merged in Middle English. Modern sense distinction between in and on is from later Middle English. Sense of "holding power" (the in party) first recorded c.1600; that of "exclusive" (the in-crowd, an in-joke) is from 1907 (in-group); that of "stylish, fashionable" (the in thing) is from 1960. The noun sense of "influence, access" (have an in with) first recorded 1929 in American English. In-and-out "copulation" is attested from 1610s.
The symbol for the element indium.
The symbol for indium.
[fr baseball; the British term, fr cricket, is always innings and is found by 1836]