Where does “between” come from?

Between derives from Middle English betwene, from Old English betwēonum, combining Proto-Germanic bi- (from Proto-Indo-European h₁epi, meaning "upon") with a form based on Proto-Indo-European dwóh₁ ("two") and key- ("to lie").

between (English): In the position or interval that separates (two things), or intermediate in quantity or degree. (See Usage notes below.)

Definitions

  1. In the position or interval that separates (two things), or intermediate in quantity or degree. (See Usage notes below.)

Ancestry of “between”, step by step

between traces back through two separate lines of ancestry.

via Middle English betwene

StepLanguageWordMeaning
1Middle Englishbetwene
2Old Englishbetwēonumbetween, among, amid, in the midst, meanwhile;...
3Old Englishbeby
4Proto-West Germanicby, at; near, around
5Proto-Germanicbiby, at; near, around
6Proto-Indo-Europeanh₂m̥bʰiaround, on either side of, about; in exchange...
7Proto-Indo-Europeanh₂n̥tbʰi
8Proto-Indo-Europeanh₂éntsforehead; front
9Proto-Indo-Europeanh₂ent-face; forehead; front
10Proto-Indo-Europeanh₂en-on, onto

via English btw

StepLanguageWordMeaning
1Englishbtw

Words derived from “between

Every word from Proto-Indo-European h₂en-Every word from Proto-Indo-European h₂ent-Every word from Proto-Indo-European h₂énts
between — Etymology, Origin & Word History | Etymology Explorer