mastery

Short definition from Wiktionary

Noun

1. 1
   The position or authority of a master; dominion; command; supremacy; superiority.
2. 2
   Superiority in war or competition; victory; triumph; preeminence.
3. 3
   The act or process of mastering; the state of having mastered; expertise.
4. 4
   A contest for superiority.
5. 5
   A masterly operation; a feat.
6. 6
   The philosopher's stone.