a man who has people working for him, especially servants or slaves

he acceded to his master's wishes

a man in charge of an organization or group

a skilled practitioner of a particular art or activity

I'm a master of disguise

a person who holds a second or further degree

a master's degree

a Master of Arts

used as a title prefixed to the name of a boy not old enough to be called ‘Mr’

Master James Wishart

an original recording, film, or document from which copies can be made

the master tape

having or showing very great skill or proficiency

you don't have to be a master chef in order to cook meat properly

a heart-warming story from a master storyteller

main; principal

the apartment's master bathroom has a free-standing oval bathtub

acquire complete knowledge or skill in (a subject, technique, or art)

I never mastered Latin

gain control of; overcome

I managed to master my fears

make a master copy of (a film or recording)

all records are now being mastered and manufactured for us in the Netherlands

a ship or boat with a specified number of masts

a three-master