(law) An officer of a court of law who examines bills of costs.

(obsolete) The navigating officer of a warship.

(obsolete) A cabinet-maker, locksmith, etc. who works on his own, not for a firm.

A husband, especially one who is domineering. / One who has control or dominance. / Used other than figuratively or idiomatically: see lord, master.

Any of various early European painters whose works are regarded as superlative. / A painting by an Old Master.

A comprehensive document that sets out an overall strategy; the strategy itself. / (architecture) A small-scale graphic outline that shows all the major elements of a project.

A quizmaster.

(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.