The Collaborative International Dictionary of English v.0.48:

Illusionist \Il*lu"sion*ist\, n.
   1. One given to illusion; a visionary dreamer.
      [1913 Webster]

   2. A magician or conjurer who produces illusions by sleight
      of hand; a prestidigitator.
      [PJC]

WordNet (r) 3.0 (2006):

illusionist
    n 1: a person with unusual powers of foresight [syn:
         visionary, illusionist, seer]
    2: someone who performs magic tricks to amuse an audience [syn:
       magician, prestidigitator, conjurer, conjuror,
       illusionist]