The Collaborative International Dictionary of English v.0.48:

Climbing \Climb"ing\,
   p. pr. & vb. n. of Climb.
   [1913 Webster]

   Climbing fern. See under Fern.

   Climbing perch. (Zool.) See Anabas, and Labyrinthici.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Climb \Climb\ (kl[imac]m), v. i. [imp. & p. p. Climbed
   (kl[imac]md), Obs. or Vulgar Clomb (kl[o^]m); p. pr. & vb.
   n. Climbing.] [AS. climban; akin to OHG. chlimban, G. & D.
   klimmen, Icel. kl[imac]fa, and E. cleave to adhere.]
   1. To ascend or mount laboriously, esp. by use of the hands
      and feet.
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   2. To ascend as if with effort; to rise to a higher point.
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            Black vapors climb aloft, and cloud the day.
                                                  --Dryden.
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   3. (Bot.) To ascend or creep upward by twining about a
      support, or by attaching itself by tendrils, rootlets,
      etc., to a support or upright surface.
      [1913 Webster]

WordNet (r) 3.0 (2006):

climbing
    n 1: an event that involves rising to a higher point (as in
         altitude or temperature or intensity etc.) [syn: climb,
         climbing, mounting]