WordWeb Online

1. Great skilfulness and knowledge of some subject or activity
   "a good mastery of French";
   - command, control
    
2. Power to dominate or defeat
   "mastery of the seas";
   - domination, supremacy
    
3. The act of mastering or subordinating someone
   - subordination

Derived forms: masteries

Type of: ascendance, ascendancy, ascendence, ascendency, control, dominance, domination, skilfulness [Brit, Cdn], skillfulness [N. Amer]

Encyclopedia: Mastery