Mastery English Flashcard
Mastery English Flashcard (noun)
/ˈmɑː.stər.i/ US /ˈmæs.tɚ-/
1. having so much expertise, competence or technical knowledge about something:
She possessed complete mastery of the piano.
2. having full control over something:
Being the chair of the meeting, he had complete mastery over the negotiation.