The Collaborative International Dictionary of English v.0.48:

Utilize \U"til*ize\, v. t. [imp. & p. p. Utilized; p. pr. &
   vb. n. Utilizing.] [Cf. F. utiliser.]
   To make useful; to turn to profitable account or use; to make
   use of; as, to utilize the whole power of a machine; to
   utilize one's opportunities.
   [1913 Webster]

         In former ages, the mile-long corridors, with their
         numerous alcoves, might have been utilized as . . .
         dungeons.                                --Hawthorne.
   [1913 Webster]

WordNet (r) 3.0 (2006):

utilized
    adj 1: put to use [syn: utilized, utilised]