Definition of masteries:
(n) :
The act or process of mastering; the state of having mastered; expertise.
(n) :
The position or authority of a master; dominion; command; supremacy; superiority.
(n) :
Superiority in war or competition; victory; triumph; preeminence.
(n) :
(obsolete) A contest for superiority.
(n) :
(obsolete) A masterly operation; a feat.
(n) :
(obsolete) The philosopher's stone.