Antonyms of noun similarity

1 of 2 senses of similarity

Sense 1
similarity -- (the quality of being similar)
       Antonym of dissimilarity (Sense 1)
      => dissimilarity, unsimilarity -- (the quality of being dissimilar)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun similarity

2 senses of similarity

Sense 1
similarity -- (the quality of being similar)
       => sameness -- (the quality of being alike; "sameness of purpose kept them together")

Sense 2
similarity, law of similarity -- (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)
       => Gestalt law of organization, Gestalt principle of organization -- (a principle of Gestalt psychology that identifies factors leading to particular forms of perceptual organization)