proposer

from WordNet (r) 3.0 (2006)

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

from The Collaborative International Dictionary of English v.0.48

Proposer \Pro*pos"er\, n.
   1. One who proposes or offers anything for consideration or
      adoption.
      [1913 Webster]

   2. A speaker; an orator. [Obs.] --Shak.
      [1913 Webster]

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