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Wordage.info / master

Exact Match:

an original creation (i.e., an audio recording) from which copies can be made
an authority qualified to teach apprentices
directs the work of other
someone who holds a master's degree from academic institution
an officer who is licensed to command a merchant ship
have a firm understanding or knowledge of; be on top of; "Do you control these data?"
be or become completely proficient or skilled in; "She mastered Japanese in less than two years"