Adjective mastered has 1 sense
  1. down, down pat, mastered - understood perfectly; "had his algebra problems down"
    Antonym: imperfect (indirect, via perfect)
,Verb master has 4 senses
  1. master, get the hang - be or become completely proficient or skilled in; "She mastered Japanese in less than two years"
    --1 is one way to know
    Derived forms: noun master1, noun mastery1, noun mastering1
    Sample sentence:
    Somebody ----s something
  2. overcome, get over, subdue, surmount, master - get on top of; deal with successfully; "He overcame his shyness"
    --2 is one way to get the better of, overcome, defeat
    Sample sentence:
    Somebody ----s something
  3. dominate, master - have dominance or the power to defeat over; "Her pain completely mastered her"; "The methods can master the problems"
    --3 is one way to control, command
    Derived forms: noun master2, noun mastery2, noun mastery3
    Sample sentences:
    Somebody ----s something
    Somebody ----s somebody
    Something ----s somebody
  4. master, control - have a firm understanding or knowledge of; be on top of; "Do you control these data?"
    --4 is one way to know
    Derived form: noun master1
    Sample sentence:
    Somebody ----s something
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