Longman Dictionary of Contemporary English homepage

mastery

 noun
     
mas‧ter‧y [uncountable]
1 thorough understanding or great skill
mastery of
She possesses complete technical mastery of her instrument.
2 complete control or power over someone or something
mastery of/over
humankind's mastery over the environment
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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