The Collaborative International Dictionary of English v.0.48:

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[2] of changes; to recur in cycles.
      --Tennyson. --Darwin.
      [1913 Webster]

   2. To ride a bicycle, tricycle, or other form of cycle.
      [1913 Webster]