The Collaborative International Dictionary of English v.0.48:

Prediction \Pre*dic"tion\, n. [L. praedictio: cf. F.
   pr['e]diction.]
   The act of foretelling; also, that which is foretold;
   prophecy.
   [1913 Webster]

         The predictions of cold and long winters. --Bacon.
   [1913 Webster]

   Syn: Prophecy; prognostication; foreboding; augury;
        divination; soothsaying; vaticination.
        [1913 Webster]

WordNet (r) 3.0 (2006):

prediction
    n 1: the act of predicting (as by reasoning about the future)
         [syn: prediction, anticipation, prevision]
    2: a statement made about the future [syn: prediction,
       foretelling, forecasting, prognostication]

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "prediction":
   aftertime, afteryears, anticipation, augury, by-and-by, cast,
   conjecture, contemplation, course ahead, crystal ball, determinism,
   discretion, distant future, envisagement, envisionment,
   eventuality, expectation, farseeingness, farsightedness, forecast,
   forefeeling, foreglance, foregleam, foreglimpse, forehandedness,
   foreseeing, foresight, foresightedness, foretelling, forward look,
   future, future tense, futurism, futurity, guess, hereafter, hint,
   hunch, immediate future, immediate prospect, imminence, intimation,
   longsightedness, looking ahead, near future, offing, outlook,
   posteriority, preapprehension, premonition, preparation,
   prepublication, presage, presagement, presentiment, preview,
   prevision, probability, prognosis, prognostication, project,
   prophecy, prospect, prospection, providence, provision, prudence,
   readiness, sagacity, suggestion, the future, the morrow,
   the sweet by-and-by, time ahead, time just ahead, time to come,
   tomorrow, weird