Usage Problem Connecting spatially: a railroad between the two cities.
Usage Problem Associating or uniting in a reciprocal action or relationship: an agreement between workers and management; a certain resemblance between the two stories.
In confidence restricted to: Between you and me, he is not qualified.
By the combined effort or effect of: Between them they succeeded.
In the combined ownership of: They had only a few dollars between them.
As measured against. Often used to express a reciprocal relationship: choose between riding and walking.
In an intermediate space, position, or time; in the interim.
in between In an intermediate situation: My roommates disagreed and I was caught in between.
in between times During an intervening period; in the meantime: has written several books and teaches in between times.