Wordnet 3.0
NOUN (1)
1. 
 the sport of gliding on skates; 
The Collaborative International Dictionary of English v.0.48:
Skate \Skate\, v. i. [imp. & p. p. Skated; p. pr. & vb. n.
   Skating.]
   To move on skates.
   [1913 Webster]
WordNet (r) 3.0 (2006):
skating
    n 1: the sport of gliding on skates