The Collaborative International Dictionary of English v.0.48:

Prostitution \Pros`ti*tu"tion\, n. [L. prostitutio: cf. F.
   prostitution.]
   1. The act or practice of prostituting or offering the body
      to an indiscriminate intercourse with men; common lewdness
      of a woman.
      [1913 Webster]

   2. The act of setting one's self to sale, or of devoting to
      infamous purposes what is in one's power; as, the
      prostitution of abilities; the prostitution of the press.
      "Mental prostitution." --Byron.
      [1913 Webster]

WordNet (r) 3.0 (2006):

prostitution
    n 1: offering sexual intercourse for pay [syn: prostitution,
         harlotry, whoredom]