The Collaborative International Dictionary of English v.0.48:

Prognostication \Prog*nos`ti*ca"tion\, n. [Cf. F.
   prognostication.]
   [1913 Webster]
   1. The act of foreshowing or foretelling something future by
      present signs; prediction.
      [1913 Webster]

   2. That which foreshows; a foretoken. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

prognostication
    n 1: a sign of something about to happen; "he looked for an omen
         before going into battle" [syn: omen, portent,
         presage, prognostic, prognostication, prodigy]
    2: a statement made about the future [syn: prediction,
       foretelling, forecasting, prognostication]
    3: knowledge of the future (usually said to be obtained from a
       divine source) [syn: prophecy, prognostication,
       vaticination]