sameness - the quality of being alike; "sameness of purpose kept them together"

approximation - the quality of coming near to identity (especially close in quantity)

homogeny - (biology) similarity because of common evolution

homology - 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; "man created God in his own likeness"

parallelism, correspondence - similarity by virtue of correspondence

uniformness, uniformity - the quality of lacking diversity or variation (even to the point of boredom)

approach - a close approximation; "the nearest approach to genius"

sort - an approximate definition or example; "she wore a sort of magenta dress"; "she served a creamy sort of dessert thing"

analog, analogue, parallel - something having the property of being analogous to something else

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