между

Inherited from Proto-Slavic *meďu, a fossilized dual locative case of *meďa (“boundary, middle”).

• IPA^(key): [mɛʒˈdu]

между́ • (meždú)

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

• измежду (izmeždu)
• помежду (pomeždu)

• межди́ (meždí) (sg. loc., obsolete)

• “между”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• “между”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010

• между- (meždu-)

Borrowed from Old Church Slavonic междоу (meždu), from Proto-Slavic *meďu, from Proto-Indo-European *médʰyos. Compare inherited East Slavic меж (mež).

• IPA^(key): [ˈmʲeʐdʊ]

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ме́жду • (méždu)

1. (with instrumental, rarely with genitive) between, among

   Synonym: меж (mež)

• In some older expressions or collocations, ме́жду (méždu) or меж (mež) is used with a genitive case, rather than the regular instrumental case, e.g. ме́жду двух огне́й (méždu dvux ognéj), ме́жду строк (méždu strok, “between the lines”), ме́жду глаз (méždu glaz, “between the eyes”).
• In various cases both genitive and instrumental are used, e.g. ме́жду ног (méždu nog, “between the legs”) or ме́жду нога́ми (méždu nogámi, “between the legs”), ме́жду о́кон (méždu ókon, “between the windows”) or ме́жду о́кнами (méždu óknami, “between the windows”)

• междунаро́дный (meždunaródnyj)

• Vasmer, Max (1964–1973) “между”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress