(role-playing games) A person conducting a role-playing game, generally responsible for controlling all beings and processes other than the players, either individually or as part of a team.

(role-playing games) A game master in Dungeons & Dragons games.

A thesis submitted for a master's degree.

plural of Master of the Universe

(religion) God / (idiomatic) A powerful person. / (idiomatic, finance, business) A highly successful business person.

plural of master's thesis

The leading entity; the most important person, the controlling figure.

plural of Master Cube

Rubik's Revenge

plural of Master of Arts