Source : Webster's Revised Unabridged Dictionary (1913)

Prognosticate \Prog*nos"ti*cate\, v. t. [imp. & p. p.
   {Prognosticated}; p. pr. & vb. n. {Prognosticating}.] [See
   {Prognostic}.]
   To indicate as future; to foretell from signs or symptoms; to
   prophesy; to foreshow; to predict; as, to prognosticate evil.
   --Burke.

         I neither will nor can prognosticate To the young
         gaping heir his father's fate.           --Dryden.

   Syn: To foreshow; foretoken; betoken; forebode; presage;
        predict; prophesy.

Source : WordNet®

prognosticate
     v 1: make a prediction about; tell in advance; "Call the outcome
          of an election" [syn: {predict}, {foretell}, {call}, {forebode},
           {anticipate}, {promise}]
     2: indicate by signs; "These signs bode bad news" [syn: {bode},
         {portend}, {auspicate}, {omen}, {presage}, {betoken}, {foreshadow},
         {augur}, {foretell}, {prefigure}, {forecast}, {predict}]