You might get annoyed if people keep saying there is a similarity between you and your older sister, particularly if you're tired of being compared to her. A similarity is a sameness or alikeness.

When you are comparing two things — physical objects, ideas, or experiences — you often look at their similarities and their differences. Difference is the opposite of similarity. Both squares and rectangles have four sides, that is a similarity between them. Just because two things share similarities doesn't mean they are the same.

Definitions of similarity

n the quality of being similar

dissimilarity, unsimilarity
the quality of being dissimilar
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the quality of coming near to identity (especially close in quantity)
(biology) similarity because of common evolution
the quality of being similar or corresponding in position or value or structure or function
homomorphism, homomorphy
similarity of form
isomorphism, isomorphy
(biology) similarity or identity of form or shape or structure
alikeness, likeness, similitude
similarity in appearance or character or nature between persons or things
correspondence, parallelism
similarity by virtue of corresponding
uniformity, uniformness
the quality of lacking diversity or variation (even to the point of boredom)
a close approximation
an approximate definition or example
analog, analogue, parallel
something having the property of being analogous to something else
homogeneity, homogeneousness
the quality of being similar or comparable in kind or nature
consistence, consistency
a harmonious uniformity or agreement among things or parts
a close parallel of a feeling, idea, style, etc.
comparability, compare, comparison, equivalence
qualities that are comparable
mirror image, reflection, reflexion
a likeness in which left and right are reversed
the likeness of a representation to the thing represented
similarity in appearance or external or superficial details
spitting image
a perfect likeness or counterpart
Type of:
the quality of being alike

n 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
Type of:
Gestalt law of organization, Gestalt principle of organization
a principle of Gestalt psychology that identifies factors leading to particular forms of perceptual organization

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