noun (n)

• skillful performance or ability without difficulty(noun.cognition)

  Synonym:
  adeptness, adroitness, deftness, facility
  

  source: wordnet30
• intelligence as revealed by an ability to give correct responses without delay(noun.cognition)

  Synonym:
  mental quickness, quick-wittedness
  

  source: wordnet30
• a rate that is rapid(noun.attribute)

  Synonym:
  celerity, rapidity, rapidness, speediness
  

  source: wordnet30
• The condition or quality of being quick or living; life.(noun)

  source: webster1913