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1. The quality of being similar
    
2. 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
   - law of similarity
    
3. Similarity in appearance or external or superficial details
   - resemblance

Derived forms: similarities

See also: dissimilar, similar

Type of: alikeness, Gestalt law of organisation [Brit], Gestalt law of organization, Gestalt principle of organisation [Brit], Gestalt principle of organization, likeness, sameness, similitude

Antonym: dissimilarity

Encyclopedia: Similarity