preposition / adverb
between
bih-TWEEN/bɪˈtwiːn/
In a position or relationship connecting or separating two or more things.
The red ball rests between two matching blue wooden blocks.

Etymology
Old English betweonum already described the space separating things. This spatial idea also provides a way to describe an interval in time or a relationship among distinct people or things.
In context
a satellite with a westward velocity component at the ascending node is in a retrograde orbit and has an orbital inclination between 90 and 180 degrees
More examples
- Divide the work between the three teams.
- She sat between her brothers.
- Choose something in between.
Forms
between
Similar words
- betwixt
- Archaic or literary equivalent, chiefly for a relationship involving two things.