Source : Webster's Revised Unabridged Dictionary (1913)

Cycle \Cy"cle\ (s?"k'l), v. i. [imp. & p. p. {Cycled}. (-k'ld);
   p. pr. & vb. n. {Cycling} (-kl?ng).]
   1. To pass through a cycle of changes; to recur in cycles.
      --Tennyson. Darwin.

   2. To ride a bicycle, tricycle, or other form of cycle.

Cycling \Cy"cling\ (s?"kl?ng), n.
   The act, art, or practice, of riding a cycle, esp. a bicycle
   or tricycle.

Source : WordNet®

cycling
     n : the sport of traveling on a bicycle or motorcycle