Definition of "gamemaster"

gamemaster

verb
third-person singular simple present gamemasters, present participle gamemastering, simple past and past participle gamemastered
1. To run a roleplaying game; to act as a gamemaster
  Quotations
  A few weeks before Wesley had asked me to gamemaster a role-playing narrative, I had purchased the Forgotten Realms Campaign Set.
  2001, Daniel Mackay, The fantasy role-playing game: a new performing art, McFarland, page 39
noun
plural gamemasters
1. Alternative spelling of game master