Wordnet 3.0
NOUN (2)
1. 
 a length of rope (usually with handles on each end) that is swung around while someone jumps over it; 
[syn: jump rope, skip rope, skipping rope]
2.  a child's game or a cardiopulmonary exercise in which the player jumps over a swinging rope; 
WordNet (r) 3.0 (2006):
jump rope
    n 1: a length of rope (usually with handles on each end) that is
         swung around while someone jumps over it [syn: jump rope,
         skip rope, skipping rope]
    2: a child's game or a cardiopulmonary exercise in which the
       player jumps over a swinging rope