From WordNet (r) 3.0 (2006) [wn]:
skating
n 1: 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]