American English

Definition of mastery noun from the Oxford Advanced American Dictionary



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  1. 1[uncountable, singular] mastery (of something) great knowledge about or understanding of a particular thing synonym command She has a mastery of several languages. The orchestra is unrivalled in terms of technical mastery and sheer vitality.
  2. 2[uncountable] mastery (of/over somebody/something) control or power human mastery of the natural world He struggled for mastery over his emotions.
See the Oxford Advanced Learner's Dictionary entry: mastery