From WordNet (r) 3.0 (2006) [wn]:
player
n 1: a person who participates in or is skilled at some game
[syn: player, participant]
2: someone who plays a musical instrument (as a profession)
[syn: musician, instrumentalist, player]
3: a theatrical performer [syn: actor, histrion, player,
thespian, role player]
4: a person who pursues a number of different social and sexual
partners simultaneously
5: an important participant (as in a business deal); "he was a
major player in setting up the corporation"
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Player \Play"er\, n.
1. One who plays, or amuses himself; one without serious
aims; an idler; a trifler. --Shak.
[1913 Webster]
2. One who plays any game.
[1913 Webster]
3. A dramatic actor. --Shak.
[1913 Webster]
4. One who plays on an instrument of music. "A cunning player
on a harp." --1 Sam. xvi. 16.
[1913 Webster]
5. A gamester; a gambler.
[1913 Webster]