Source : Webster's Revised Unabridged Dictionary (1913)

Comedian \Co*me"di*an\, n. [Cf. F. com['e]dien.]
   1. An actor or player in comedy. ``The famous comedian,
      Roscius.'' --Middleton.

   2. A writer of comedy. --Milton.

Source : WordNet®

comedian
     n 1: a professional performer who tells jokes and performs
          comical acts [syn: {comic}]
     2: an actor in a comedy