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master

adjective
  1. most important element
    main
noun
  1. an original creation (i.e., an audio recording) from which copies can be made
    original
  2. key that secures entrance everywhere
    passe-partoutpasskeymaster key
  3. presiding officer of a school
    schoolmaster
  4. an artist of consummate skill
    “a master of the violin”
    maestro
  5. an authority qualified to teach apprentices
    professional
  6. directs the work of others
  7. someone who holds a master's degree from academic institution
  8. an officer who is licensed to command a merchant ship
    captainskippersea captain
  9. a person who has general authority over others
    overlordlord
  10. a combatant who is able to defeat rivals
    superior
verb
  1. have a firm understanding or knowledge of
    control
  2. be or become completely proficient or skilled in
    “The student has mastered Japanese in less than two years.”
    get the hang
  3. get on top of
    subdueget overovercomesurmount
  4. have dominance or the power to defeat over
    “The pain completely mastered me.”
    dominate