mastery
n. uncountablen. the state of being extremely skilled at something or having complete control over it.
n. comprehensive knowledge or skill in a particular subject or activity; also refers to the state of having control or dominance over something.
She showed complete mastery of the piano.
The chef's mastery of French cuisine is evident in every dish he prepares for the restaurant.
True mastery of a foreign language requires not only a vast vocabulary but also an intuitive grasp of cultural nuances and idiomatic expressions that textbooks often fail to capture.
From Middle English maistery, maistrie, mastere, mastry, from Old French maistrie, equivalent to master + -y.
Uncountable in its abstract sense; often takes the preposition 'of' followed by the subject being mastered.