Meaning of “mastery” - Learner’s Dictionary

mastery

noun [ U ] uk us /ˈmɑːstəri/
mastery of sth

great skill or understanding of something:

his mastery of the Japanese language
mastery of/over sth

control over something:

The two countries battled for mastery over the region.

(Definition of “mastery” from the Cambridge Learner’s Dictionary © Cambridge University Press)

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