betweens is a form of:

Between



noun
1.
(that connects, by the joint action of, in the space which separates (two objects or things), in the time which separates (one thing from another), more than one thing and less than another, from one to another, connecting) រវាង between two points ចន្លោះ
ENGLISH MEANING
noun
1.
Intermediate time or space; interval.
Preposition
1.
In the space which separates; betwixt; as, New York is between Boston and Philadelphia.
2.
Used in expressing motion from one body or place to another; from one to another of two.
3.
Belonging in common to two; shared by both.
4.
Belonging to, or participated in by, two, and involving reciprocal action or affecting their mutual relation; as, opposition between science and religion.
5.
With relation to two, as involved in an act or attribute of which another is the agent or subject; as, to judge between or to choose between courses; to distinguish between you and me; to mediate between nations.
6.
In intermediate relation to, in respect to time, quantity, or degree; as, between nine and ten o'clock.