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master-at-arms in the U.S. Navy, a petty officer whose duty is to keep order and maintain discipline on board a ship or at a shore station.
master bedroom in a home with multiple bedrooms, the largest bedroom or one with a special feature such as a fireplace or attached bathroom, usually used by the head or heads of the household.
master builder a skilled building contractor or architect, often the supervisor of construction operations and crew.
master class a small class for very advanced students, esp. a class in musical performance taught by a master musician.
masterful showing expert skill or mastery; authoritative.
master hand an expert. [2 definitions]
master key a key that will open all the locks in a given set, though the keys to these locks are not alike.
masterly befitting or worthy of a master.
master mechanic a highly skilled mechanic, esp. one who supervises other mechanics.
mastermind to cleverly plan and supervise the development of. [2 definitions]
Master of Arts a graduate degree, below that of doctor, that is given by a college or university to a person who has completed a prescribed course of graduate study in the humanities or social sciences; master's degree. (abbr.: M.A.)
master of ceremonies one who hosts a formal event or entertainment, usu. making speeches or announcing guests; emcee.
Master of Science a master's degree awarded usu. in science, technology, or mathematics. (abbr.: M.S.)
masterpiece a work of art of the highest quality. [2 definitions]
master's degree a degree that you get after finishing an advanced program of study at a college or university.
master sergeant in the U.S. military, a noncommissioned officer of high rank, second only to the rank of sergeant major.
mastership the state of being a master; authority; control. [3 definitions]
masterstroke an extremely clever or skillful action or accomplishment.
masterwork an art work of the finest quality; masterpiece.
mastery the qualities of skill, knowledge, and expertise. [3 definitions]
masthead the top of a ship's mast. [2 definitions]