Dungeon Master

Dungeon Master, commonly abbreviated to DM, is the term used for game masters for Dungeons and Dragons(D&D) since Basic Dungeons and Dragons (BD&D, 1977) and is still used current editions. In original Dungeons and Dragons, the game master was referred to as the "referee". Though the term refers to game masters for D&D specifically, the ubiquity of the game has caused it colloquially to bleed into games with similar fantasy settings as well, such as Pathfinder.