The Collaborative International Dictionary of English v.0.48:

Futurist \Fu"tur*ist\, n.
   1. One whose chief interests are in what is to come; one who
      anxiously, eagerly, or confidently looks forward to the
      future; an expectant.
      [1913 Webster]

   2. (Theol.) One who believes or maintains that the
      fulfillment of the prophecies of the Bible is to be in the
      future.
      [1913 Webster]

WordNet (r) 3.0 (2006):

futurist
    adj 1: of or relating to futurism; "futurist art" [syn:
           futuristic, futurist]
    n 1: a theologian who believes that the Scripture prophecies of
         the Apocalypse (the Book of Revelation) will be fulfilled
         in the future
    2: someone who predicts the future [syn: fantast, futurist]