Source : Webster's Revised Unabridged Dictionary (1913)

Proposer \Pro*pos"er\, n.
   1. One who proposes or offers anything for consideration or
      adoption.

   2. A speaker; an orator. [Obs.] --Shak.

Source : WordNet®

proposer
     n 1: someone who advances a suggestion or proposal; "the
          suggester of this absurd strategy was a fool" [syn: {suggester}]
     2: (parliamentary procedure) someone who makes a formal motion
        [syn: {mover}]