From WordNet (r) 2.0 (August 2003) [wn]:
skating
n : the sport of gliding on skates
From The Collaborative International Dictionary of English v.0.48 [gcide]: Skate \Skate\, v. i. [imp. & p. p. Skated; p. pr. & vb. n. Skating.] To move on skates. [1913 Webster]