gamer (n.) Look up gamer at Dictionary.com
1620s, "an athlete," agent noun from game (v.). Meaning "one devoted to playing video or computer games" is attested from 1993. Gamester is attested from 1590s but meant "prostitute" (compare old slang the first game ever played "copulation"), later "a man fit and ready for anything, a player" (mid-17c.).