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1. Skilful performance or ability without difficulty
   - adeptness, adroitness, deftness, facility
    
2. Intelligence as revealed by an ability to give correct responses without delay
   - mental quickness, quick-wittedness
    
3. A rate that is rapid
   - celerity, rapidity, rapidness, speediness

Derived forms: quicknesses

See also: quick

Type of: intelligence, pace, rate, skilfulness [Brit, Cdn], skillfulness [N. Amer]

Encyclopedia: Quickness