inne-

Etymology
From and, adverbial form of.

An alternative adverb (chiefly in Upper German) was, whence modern. These then came to be distinguished in such a way that the short-vowel form expressed stationary location (adverb of + dative), while the long-vowel form expressed movement (adverb of  + accusative). This distinction is largely maintained in modern German (cf. vs. ). Accordingly the prefix  is generally used with stationary verbs.

Prefix

 * 1)  in, inside, interior