The Collaborative International Dictionary of English v.0.48:

Luxuriate \Lux*u"ri*ate\, v. i. [imp. & p. p. Luxuriated; p.
   pr. & vb. n. Luxuriating.] [L. luxuriatus, p. p. of
   luxuriari, -are, to luxuriate. See Luxury.]
   [1913 Webster]
   1. To grow exuberantly; to grow to superfluous abundance. "
      Corn luxuriates in a better mold." --Burton.
      [1913 Webster]

   2. To feed or live luxuriously; as, the herds luxuriate in
      the pastures.
      [1913 Webster]

   3. To indulge with unrestrained delight and freedom; as, to
      luxuriate in description.
      [1913 Webster]

WordNet (r) 3.0 (2006):

luxuriate
    v 1: become extravagant; indulge (oneself) luxuriously [syn:
         luxuriate, wanton]
    2: enjoy to excess; "She indulges in ice cream" [syn: indulge,
       luxuriate]
    3: thrive profusely or flourish extensively

Moby Thesaurus II by Grady Ward, 1.0:

67 Moby Thesaurus words for "luxuriate":
   appreciate, bask, bask in, bud, burgeon, burst forth, delight in,
   eat up, enjoy, feast, fill, flood, flourish, gemmate, germinate,
   grow, grow rank, have a ball, indulge, indulge in, know no bounds,
   leaf, leaf out, leave, like, love, luxuriate in, overabound,
   overbrim, overdo, overflow, overgrow, overindulge, overrun,
   overspill, overspread, overswarm, pullulate, put forth,
   put forth leaves, put out buds, relish, revel, revel in, riot,
   roll, rollick, root, run riot, savor, shoot, shoot up, spill over,
   sprout, sprout up, strike root, superabound, swarm, swim in,
   take it easy, take root, teem, upspear, upsprout, vegetate,
   wallow in, welter