Source : Webster's Revised Unabridged Dictionary (1913)

Participant \Par*tic"i*pant\, n.
   A participator; a partaker.

         Participants in their . . . mysterious rites. --Bp.
                                                  Warburton.

Participant \Par*tic"i*pant\, a. [L. participans, p. pr. of
   participare: cf. F. participant. See {Participate}.]
   Sharing; participating; having a share of part. --Bacon.

Source : WordNet®

participant
     n 1: someone who takes part in an activity
     2: a person who participates in or is skilled at some game
        [syn: {player}]