The state or characteristic of being complementary.
A semantic relationship between two words wherein negative use of one entails the affirmative of the other with no gradability; the relation of binary antonyms.
The quality of agreeing or corresponding; being suitable and appropriate.
Matrix similarity by an orthogonal matrix.
A relation between two numbers indicating they give the same remainder when divided by some given number.
More generally: any equivalence relation defined on an algebraic structure which is preserved by operations defined by the structure.
The quality of being isometric — roughly, the same measure and shape.