между

Etymology
, a fossilized dual locative case of.

Preposition

 * 1) between (in the position or interval that separates two things)

Etymology
, from, from. Compare inherited East Slavic.

Preposition

 * 1) between, among

Usage notes

 * In some older expressions or collocations, or  is used with a genitive case, rather than the regular instrumental case, e.g., ,.
 * In various cases both genitive and instrumental are used, e.g. or,  or