The Collaborative International Dictionary of English v.0.48:

Groove \Groove\, v. t. [imp. & p. p. Grooved; p. pr. & vb. n.
   Groving.]
   To cut a groove or channel in; to form into channels or
   grooves; to furrow.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Groove \Groove\, n. [D. groef, groeve; akin to E. grove. See
   Grove.]
   1. A furrow, channel, or long hollow, such as may be formed
      by cutting, molding, grinding, the wearing force of
      flowing water, or constant travel; a depressed way; a worn
      path; a rut.
      [1913 Webster]

   2. Hence: The habitual course of life, work, or affairs;
      fixed routine.
      [1913 Webster]

            The gregarious trifling of life in the social
            groove.                               --J. Morley.
      [1913 Webster]

   3. [See Grove.] (Mining) A shaft or excavation. [Prov.
      Eng.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

groove
    n 1: a long narrow furrow cut either by a natural process (such
         as erosion) or by a tool (as e.g. a groove in a phonograph
         record) [syn: groove, channel]
    2: a settled and monotonous routine that is hard to escape;
       "they fell into a conversational rut" [syn: rut, groove]
    3: (anatomy) any furrow or channel on a bodily structure or part
       [syn: groove, vallecula]
    v 1: make a groove in, or provide with a groove; "groove a vinyl
         record"
    2: hollow out in the form of a furrow or groove; "furrow soil"
       [syn: furrow, rut, groove]

Moby Thesaurus II by Grady Ward, 1.0:

249 Moby Thesaurus words for "groove":
   abysm, abyss, alameda, arroyo, ascender, autolithograph, back,
   bastard type, be a printmaker, beard, beat, beaten path,
   beaten track, belly, berm, bevel, bezel, bicycle path,
   black letter, boardwalk, body, bore, box canyon, breach, break,
   bridle path, bureaucracy, bureaucratism, burrow, canal, canalize,
   canyon, cap, capital, carve, case, catwalk, cavity, chamfer,
   channel, chap, character, chase, chasm, check, chimney, chink,
   chinoiserie, chisel, cleave, cleft, cleuch, clough, col, corrugate,
   corrugation, coulee, couloir, counter, crack, cranny, crease,
   crevasse, crevice, cribble, crimp, crosshatch, cut, cut apart, cwm,
   dado, daily grind, defile, dell, delve, descender, dig, dig out,
   dike, ditch, donga, draw, dredge, drill, drive, em, en, enchase,
   engrave, engraving, esplanade, excavate, excavation, face,
   fastwalk, fat-faced type, fault, feet, fissure, flaw, flume, flute,
   fluting, font, foot pavement, footpath, footway, fracture, furrow,
   gap, gape, garden path, gash, glyph, goffer, gorge, gouge,
   gouge out, grave, grind, grub, gulch, gulf, gully, hatch,
   hiking trail, hole, incise, incision, inscribe, italic, jog trot,
   joint, kloof, leak, letter, ligature, line, lithograph, logotype,
   lower, lower case, majuscule, make prints, mall, mark, microgroove,
   mine, minuscule, moat, nick, notch, nullah, open, opening, pace,
   parade, pass, passage, path, pathway, pi, pica, pleat, plow, point,
   prado, print, promenade, public walk, quarry, rabbet, ravine,
   red tape, red-tapeism, rent, rifle, rifling, rift, rime, rive,
   roman, rote, round, routine, ruck, run, runway, rupture, rut,
   sans serif, sap, scissure, scoop, scoop out, score, scrabble,
   scrape, scratch, script, sculpture, seam, shank, shoulder, shovel,
   sidewalk, sink, slit, slot, small cap, small capital, spade, split,
   squirrel cage, stamp, stem, stipple, streak, stria, striate,
   striation, sulcation, sulcus, tool, towing path, towpath, track,
   trail, treadmill, trench, trottoir, trough, tunnel, type,
   type body, type class, type lice, typecase, typeface, typefounders,
   typefoundry, upper case, valley, void, wadi, walk, walkway,
   well-worn groove, wrinkle