From Longman Dictionary of Contemporary Englishgamergam‧er /ˈɡeɪmə $ -ər/ noun [countable] informal 1 someone who plays computer games2 American English a person who is very good at a sport and helps their team to win games
Examples from the Corpus
gamer• But my guide was an Obi-Wan Kenobi among gamers.• Ever wondered why 98% of Commodore gamers are male?• It may seem a little loopy that computer gamers have a league of their own, with six-figure prize money to boot.• Eight gamers can play on a Local Area Network.• The clip from the game you can watch from the links on the right is for gamers aged over 18.• Nintendo has the opportunity to give gamers a whole new experience.• But it is the blood and guts stuff which will have gamers hooked. 