The "bar line" is the division line and the space in between is properly called a "measure." We've been using the slang and interchanging them for a long time, but the proper term, as when you teach a child music, is "measure," as in measurement. Technically a bar has no beats, all the beats are within the bar lines, ie, the measure. Only intro pick-up notes are not within a measure and that is called a partial measure.

Spaw