groove

Short definition from Wiktionary

Noun

1. 1
   A long, narrow channel or depression; e.g., such a slot cut into a hard material to provide a location for an engineering component, a tire groove, or a geological channel or depression.
2. 2
   A fixed routine.
3. 3
   The middle of the strike zone in baseball where a pitch is most easily hit.
4. 4
   A pronounced, enjoyable rhythm.
5. 5
   A good feeling (often as in the groove).
6. 6
   A shaft or excavation.
7. 7
   The optimal route around the track, or any of several such routes.

Verb

1. 1
   To cut a groove or channel in; to form into channels or grooves; to furrow.
2. 2
   To perform, dance to, or enjoy rhythmic music.