EnglishMain Dictionary
mastery
Universal Words
noun
1 [U,sing.] ~ (of sth) great knowledge about or understanding of a particular thing:
She has mastery of several languages. * The orchestra is unrivalled in terms of technical mastery and sheer vitality.
2 [U] ~ (of / over sb/sth) control or power:
human mastery of the natural world * He struggled for mastery over his emotions.