Wordnet 3.0
NOUN (1)
1.
a Gestalt principle of organization holding that (other things being equal) parts of a stimulus field that are similar to each other tend to be perceived as belonging together as a unit;
[syn: similarity, law of similarity]
WordNet (r) 3.0 (2006):
law of similarity
n 1: a Gestalt principle of organization holding that (other
things being equal) parts of a stimulus field that are
similar to each other tend to be perceived as belonging
together as a unit [syn: similarity, law of similarity]