1having or showing very great skill or proficiency:a master painter denoting a person skilled in a particular trade and able to teach others:a master bricklayer
2main; principal:the master bedroom
chiefly historical a man who has people working for him, especially servants or slaves:he acceded to his master’s wishes
a person who has complete control of something:he was master of the situation dated a male head of a household: the master of the house the male owner of a dog, horse, or other domesticated animal: in many ways dogs reflect the styles of their masters a machine or device directly controlling another: [as modifier]:a master cylinderCompare with slave. 2a man in charge of an organization or group, in particular: British a male schoolteacher:the games master the head of a college or school. the presiding officer of a livery company or Masonic lodge. the captain of a merchant ship. the person in control of a pack of hounds: the master of the Aylesbury Vale Hunt (in England and Wales) an official of the Supreme Court. 3a skilled practitioner of a particular art or activity:I’m a master of disguise a great artist or musician: follow in the footsteps of the masters and paint in locations made famous by their work a very strong chess player, especially one who has qualified for the title at international tournaments: a chess masterSee also grand master. (Masters) [treated as singular] (in some sports) a class for competitors over the usual age for the highest level of competition. 4 [usually in titles] a person who holds a second or further degree:a master’s degree a Master of Arts (master's) a postgraduate degree:I had a master’s in computer engineering 5used as a title prefixed to the name of a boy not old enough to be called ‘Mr’:Master James Wishart archaic a title for a man of high rank or learning. the title of the heir apparent of a Scottish viscount or baron.
6an original film, recording, or document from which copies can be made: [as modifier]:the master tape 1acquire complete knowledge or skill in (a subject, technique, or art):I never mastered Latin 2gain control of; overcome:I managed to master my fears
3make a master copy of (a film or recording): all records are now being mastered and manufactured for us in the Netherlands