The Collaborative International Dictionary of English v.0.48:

Luxurious \Lux*u"ri*ous\, a. [L. luxuriosus: cf. F. luxurieux.
   See Luxury.]
   Of or pertaining to luxury; ministering to luxury; supplied
   with the conditions of luxury; as, a luxurious life; a
   luxurious table; luxurious ease. " Luxurious cities. "
   --Milton. -- Lux*u"ri*ous*ly, adv. -- Lux*u"ri*ous*ness,
   n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

luxuriousness
    n 1: wealth as evidenced by sumptuous living [syn: luxury,
         luxuriousness, opulence, sumptuousness]