The Collaborative International Dictionary of English v.0.48:

Materialistic \Ma*te`ri*al*is"tic\, Materialistical
\Ma*te`ri*al*is"tic*al\, a.
   Of or pertaining to materialism or materialists; of the
   nature of materialism.
   [1913 Webster]

         But to me his very spiritualism seemed more
         materialistic than his physics.          --C. Kingsley.
   [1913 Webster]

   2. Primarily concerned with material objects and worldly
      activities, as contrasted with spiritual, moral or
      philosophical concerns; especially, concerned primarily
      with gaining money and the things that money can buy.
      [PJC]

WordNet (r) 3.0 (2006):

materialistic
    adj 1: marked by materialism [syn: materialistic, mercenary,
           worldly-minded]
    2: conforming to the standards and conventions of the middle
       class; "a bourgeois mentality" [syn: bourgeois,
       conservative, materialistic]