gamemasterEnglishOxford New American Dictionarygamemaster /ˈɡā(m)ˌmastər, ˈɡeɪ(m)ˌmæstər / ▸ noun a person who organizes and oversees a role-playing game, in particular by narrating the details of the story that are not controlled by the players: the gamemaster's meticulous planning.