Meaning of “mastery” in the English Dictionary

"mastery" in American English

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masterynoun [ U ]

us /ˈmæs·tər·i/

mastery noun [ U ] (SKILL)

great skill in a particular job or activity:

Louis Armstrong’s mastery of the trumpet is legendary.
Only a singer of Fitzgerald's mastery could have tackled such an immense project.

mastery noun [ U ] (CONTROL)

complete control:

Of course mastery over one's circumstances may give rise to arrogance and intolerance (= make someone think he or she is better than other people).

(Definition of “mastery” from the Cambridge Academic Content Dictionary © Cambridge University Press)