The position or authority of a master; dominion; command; supremacy; superiority. / Superiority in war or competition; victory; triumph; preeminence.

plural of mastery

The conscious control of one's behaviour; self-command.

(education) A teaching philosophy stating that students must achieve a level of mastery in each topic (e.g. 90% in a test) before moving on to further topics.

(education) The combination of flipped learning and mastery learning.