Definition: racing

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Source: WordNet (r) 1.7 

racing
     n : the sport of engaging in contests of speed

Source: Webster's Revised Unabridged Dictionary (1913) 

Race \Race\, v. i. [imp. & p. p. Raced; p. pr. & vb. n.
   Racing.]
   1. To run swiftly; to contend in a race; as, the animals
      raced over the ground; the ships raced from port to port.

   2. (Steam Mach.) To run too fast at times, as a marine engine
      or screw, when the screw is lifted out of water by the
      action of a heavy sea.
Racing \Ra"cing\,
   a. & n. from Race, v. t. & i.

   Racing crab (Zo["o]l.), an ocypodian.