Quick definitions from Macmillan ( )

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Quick definitions from WordNet (master)

▸ noun:  an original creation (i.e., an audio recording) from which copies can be made
▸ noun:  an authority qualified to teach apprentices
▸ noun:  directs the work of other
▸ noun:  someone who holds a master's degree from academic institution
▸ noun:  an officer who is licensed to command a merchant ship
▸ noun:  an artist of consummate skill ("A master of the violin")
▸ noun:  a person who has general authority over others
▸ noun:  a combatant who is able to defeat rivals
▸ noun:  presiding officer of a school
▸ noun:  key that secures entrance everywhere
▸ verb:  have a firm understanding or knowledge of; be on top of
▸ verb:  be or become completely proficient or skilled in ("She mastered Japanese in less than two years")
▸ verb:  have dominance or the power to defeat over ("Her pain completely mastered her")
▸ verb:  get on top of; deal with successfully
▸ name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #13713)

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▸ Word origin