Wordnet 3.0
NOUN (1)
1.
a sport adapted from jujitsu (using principles of not resisting) and similar to wrestling;
developed in Japan;
The Collaborative International Dictionary of English v.0.48:
judo \judo\ n.
a sport adapted from jujitsu, originally a method of
self-defense without weapons, and similar to wrestling; it
was developed in Japan.
[WordNet 1.5 +PJC]
WordNet (r) 3.0 (2006):
judo
n 1: a sport adapted from jujitsu (using principles of not
resisting) and similar to wrestling; developed in Japan