Source : Webster's Revised Unabridged Dictionary (1913)

Performer \Per*form"er\, n.
   One who performs, accomplishes, or fulfills; as, a good
   promiser, but a bad performer; especially, one who shows
   skill and training in any art; as, a performer of the drama;
   a performer on the harp.

Source : WordNet®

performer
     n : an entertainer who performs a dramatic or musical work for
         an audience [syn: {performing artist}]