Definition of "between"

between

/bɪˈtwiːn/

preposition
1. In the position or interval that separates (two things), or intermediate in quantity or degree. (See Usage notes below.)
  Quotations
  Thus, when he drew up instructions in lawyer language, he expressed the important words by an initial, a medial, or a final consonant, and made scratches for all the words between; his clerks, however, understood him very well.
  1892, Walter Besant, “Prologue: Who is Edmund Gray?”, in The Ivory Gate […], New York, N.Y.: Harper & Brothers, […]
  Energy has seldom been found where we need it when we want it. Ancient nomads, wishing to ward off the evening chill and enjoy a meal around a campfire, had to collect wood and then spend time and effort coaxing the heat of friction out from between sticks to kindle a flame.
  2013 July-August, Henry Petroski, “Geothermal Energy”, in American Scientist, volume 101, number 4
2. Done together or reciprocally.
  Quotations
  She mixed furniture with the same fatal profligacy as she mixed drinks, and this outrageous contact between things which were intended by Nature to be kept poles apart gave her an inexpressible thrill.
  1935, George Goodchild, chapter 1, in Death on the Centre Court
3. Shared in confidence.
4. In transit from (one to the other, or connecting places).
  Quotations
  [If] you don’t want to flip the channels between Biden and Trump, join [the] live chat, [which is covering] both town halls.
  2020, Lisa Lerer, “This Is Not the Debate We Wanted”, in The New York Times‎
5. Combined (by effort or ownership).
6. One of (representing a choice).
7. Taking together the combined effect of.
noun
plural betweens
1. A kind of needle, shorter than a sharp, with a small rounded eye, used for making fine stitches on heavy fabrics.