Merriam-Webster's Collegiate® Dictionary, 11th Edition
GROOVE
I. noun see: grave
Date: 1659
a long narrow channel or depression,
2. a fixed routine ; rut , a situation suited to one's abilities or interests ; niche , top form , the middle of the strike zone in baseball where a pitch is most easily hit , an enjoyable or exciting experience, a pro noun ced enjoyable rhythm,
II. verb (grooved; grooving)
Date: 1686
transitive verb
1. to make a groove in, to join by a groove, to perfect by repeated practice , to throw (a pitch) in the groove, intransitive verb to become joined or fitted by a groove, to form a groove, to enjoy oneself intensely, to interact harmoniously , groover noun