An Etymological Dictionary of the German Language/Annotated/in

by Friedrich Kluge

in, preposition, ‘in, into, at,’ from the equivalent Middle High German and Old High German in, a common Teutonic preposition with the same form; compare Gothic, Anglo-Saxon, English, Dutch, and Old Saxon in, ‘in.’ Its primitive kinship with Latin in, Greek ἐν, ἐνί, Lithuanian i, and Lettic ë is certain. To this are allied indem, indeß, and indessen.