Wordnet 3.0
NOUN (1)
1. 
 intelligence as revealed by an ability to give correct responses without delay; 
[syn: mental quickness, quickness, quick-wittedness]
The Collaborative International Dictionary of English v.0.48:
Quick-wittedness \Quick"-wit`ted*ness\, n.
   Readiness of wit. "Celtic quick-wittedness." --M. Arnold.
   [1913 Webster]
WordNet (r) 3.0 (2006):
quick-wittedness
    n 1: intelligence as revealed by an ability to give correct
         responses without delay [syn: mental quickness,
         quickness, quick-wittedness]