Definition of "gamer"

gamer¹

/ˈɡeɪmɚ/

noun
plural gamers
1. A person who plays any kind of game.
  Quotations
  […] any dice-player, carder, tennis player, or other unlawful gamer.
  1422, Code of Laws of Walsall
  These dice are the gamers' weapons […]
  2002, Gary Alan Fine, Shared Fantasy: Role Playing Games as Social Worlds, page 93
2. A person whose hobby is video games.
  Quotations
  That the Parliament congratulates the online gamer, Harry Brewis, who is known by the handle HBomberGuy, […]
  2019, The Scottish Parliament, Motion S5M-15504
3. A person who games the system.
  Quotations
  […] the real "takers" in this country are commercial gamers of the system who are only in it to swipe a fast buck from the common trust.
  2016, Eric Lovald, Hugely Confused
4. (obsolete) A gambler.
  Quotations
  The gamer is farther from restoration even than the drunkard, because what he does he does in the light of sobriety and reason.
  1845 The Head Quarters, Volume III, Number 122 (November 19, 1845)

gamer²

/ˈɡeɪmɚ/

adjective
1. comparative form of game: more game