Easy musical tem question?

One thing for sure - there are LOTS of definitions out there *whew.

That said, here are a few -mostly from organizations that judge performances.

"The ensemble exhibits control of all aspects of rhythm, tempo and pulse."

"We start feeling the basic subdivisions. We clean up the articulations. We clear up the optical illusions. We spend time on time."

It's the idea of playing rhythms so as to communicate the pulse or groove of a piece. Can't be sloppy and communicate the composer's intent.

Hope this helps!