Synonyms for Between:

adj.

middle (adjective)
midway, betwixt and between, intermediate.

adv.

all (adverb)
betwixt.
middle from two points (adverb)
midway, betwixt, in, intervening, in the middle, within, in the thick of, centrally located, mid, Interpolated, halfway, bounded by, medially, enclosed by, 'tween, Inserted.

n.

last, sometime, then, here, before, This, all, Until, Whenever, when. intermediate, equidistant, in our/their/your midst, poised. vicarious, First-hand, Participative, squarely, directly, first/second/third hand, direct, from the horse's mouth, through someone's eyes, close to home. between (noun)
betwixt, 'tween.

v.

separating (verb)
medially, in, connecting, enclosed by, midway, in the middle, within, Interpolated, intermediate to, halfway, Linking, intervening, Inserted, in the thick of, mid, betwixt and between, bounded by, in-between, sandwichwise, centrally located, Interjacent.

Other synonyms:

in-between, halfway, equidistant, midway, mid, intervening. poised. Other relevant words:
in-between, equidistant, betwixt, bounded by, intervening, halfway, medially, when, enclosed by, direct, within, in the middle, mid, centrally located, intermediate, Inserted, Interpolated, in, in the thick of, betwixt and between, midway.

Usage examples for between

  1. It must be a secret between us. – Star-Dust A Story of an American Girl by Fannie Hurst
  2. But there was something between these two, Maggie and Aunt Anne. – The Captives by Hugh Walpole