between
adv. placeadv. in the space or time that separates two things. You use this when you are talking about being in the middle of two points.
adv. in or into an intervening space, time, or position. Often used to describe a middle point between two distinct limits or objects.
The two houses are far apart with a small garden between.
The train stops at London and Edinburgh, but it does not stop anywhere between.
The curtains were slightly parted, and a thin sliver of light shone through the gap between.
PIE word *dwóh₁ From Middle English betwene, from Old English betwēonum (“between, among”, dative plural, literally “by the two, near both”), from Proto-Germanic bi- (“be-”) + twīhnaz (“two each”), corresponding to be- + twain. Cognate with Scots between (“between”), Scots atween (“between”), Gothic 𐍄𐍅𐌴𐌹𐌷𐌽𐌰𐌹 (tweihnai, “two each”), Old English betweoh (“between”), Old English twinn (“double, twofold”). More at betwixt, twin. More distantly related to Ancient Greek διά (diá, “through, across, by, over”) whence English dia- (“through, across, between”). For the meaning development also compare with Mongolian хооронд (xoorond, “between”), connected with Mongolian хоёр (xojor, “two”).
When used as an adverb, it does not take a following object; if an object follows, the word functions as a preposition.