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