in

Part of speech: preposition
(Dat, Acc) 1. in a spatial sense: in, into; among; 2. in a temporal sense: in, at, about; during
Etymology
[Mod E INProt-Germ *en-, *in-; Goth in; O Fris in, en; O Sax in; Dt in; OHG in (Mod G in); Icel í ← Indo-Europ *en-; Anc Gr ἐν, ἐνί “in, on”; Lat in “in, to, on”; O Ir i “in”; O Prus en “in, inside”; Lith iņ “in, inside”; O Slav въ (Russ в “in”)]