The Collaborative International Dictionary of English v.0.48:

Prophesy \Proph"e*sy\, v. t. [imp. & p. p. Prophesied; p. pr.
   & vb. n. Prophesying.] [See Prophecy.]
   1. To foretell; to predict; to prognosticate.
      [1913 Webster]

            He doth not prophesy good concerning me. --1 Kings
      xxii. 8.
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            Then I perceive that will be verified
            Henry the Fifth did sometime prophesy. --Shak.
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   2. To foreshow; to herald; to prefigure.
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            Methought thy very gait did prophesy
            A royal nobleness; I must embrace thee. --Shak.
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The Collaborative International Dictionary of English v.0.48:

Prophesy \Proph"e*sy\, v. i.
   [1913 Webster]
   1. To utter predictions; to make declaration of events to
      come. --Matt. xv. 7.
      [1913 Webster]

   2. To give instruction in religious matters; to interpret or
      explain Scripture or religious subjects; to preach; to
      exhort; to expound. --Ezek. xxxvii. 7.
      [1913 Webster]

WordNet (r) 3.0 (2006):

prophesy
    v 1: predict or reveal through, or as if through, divine
         inspiration [syn: prophesy, vaticinate]
    2: deliver a sermon; "The minister is not preaching this Sunday"
       [syn: preach, prophesy]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "prophesy":
   adumbrate, anticipate, approach, augur, await, be destined,
   be fated, be imminent, be to be, be to come, bode,
   cast a horoscope, cast a nativity, come, come on, divine, dope,
   dope out, dowse for water, draw near, draw on, expect, forebode,
   forecast, foresee, foreshadow, foretell, forewarn, fortune-tell,
   guess, harbinger, hariolate, herald, hope, lie ahead, look for,
   look forward to, loom, make a prediction, make a prognosis,
   make a prophecy, near, plan, plot, portend, predict, prefigure,
   presage, prognosticate, project, promise, read palms,
   read tea leaves, read the future, soothsay, speculate,
   tell fortunes, tell the future, threaten, vaticinate