Source : Webster's Revised Unabridged Dictionary (1913)

Promoter \Pro*mot"er\, n.
   1. One who, or that which, forwards, advances, or promotes;
      an encourager; as, a promoter of charity or philosophy.
      --Boyle.

   2. Specifically, one who sets on foot, and takes the
      preliminary steps in, a scheme for the organization of a
      corporation, a joint-stock company, or the like.

   3. One who excites; as, a promoter of sedition.

   4. An informer; a makebate. [Obs.] --Tusser.

Source : WordNet®

promoter
     n 1: someone who is an active supporter and advocate [syn: {booster},
           {plugger}]
     2: a sponsor who books and stages public entertainments [syn: {showman},
         {impresario}]