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English definition of “mastery”

mastery

noun [U]     /ˈmɑːstəri/
mastery of sth great skill or understanding of something: his mastery of the Japanese language Knowing and learning
mastery of/over sth control over something: The two countries battled for mastery over the region .Power to control
(Definition of mastery noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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