Source : Webster's Revised Unabridged Dictionary (1913)

Orator \Or"a*tor\, n. [L., fr. orare to speak, utter. See
   {Oration}.]
   1. A public speaker; one who delivers an oration; especially,
      one distinguished for his skill and power as a public
      speaker; one who is eloquent.

            I am no orator, as Brutus is.         --Shak.

            Some orator renowned In Athens or free Rome.
                                                  --Milton.

   2. (Law)
      (a) In equity proceedings, one who prays for relief; a
          petitioner.
      (b) A plaintiff, or complainant, in a bill in chancery.
          --Burrill.

   3. (Eng. Universities) An officer who is the voice of the
      university upon all public occasions, who writes, reads,
      and records all letters of a public nature, presents, with
      an appropriate address, those persons on whom honorary
      degrees are to be conferred, and performs other like
      duties; -- called also {public orator}.

Source : WordNet®

orator
     n : a person who delivers a speech or oration [syn: {speechmaker},
          {rhetorician}, {public speaker}, {speechifier}]