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1 Conformal modulus, a measure of the size of a curve family. 2  Modulus of continuity, a function gauging the uniform continuity of a function. 3  Modular arithmetic, the modulus being the value at which numbers wrap around.  Similarly, the modulus of a Dirichlet character.
congruence. n. 1. the quality or state of corresponding, agreeing, or being congruent. 2. (Mathematics) maths the relationship between two integers, x and y, such that their difference, with respect to another positive integer called the modulus, n, is a multiple of the modulus.Usually written x â¡ y (mod n), as in 25 â¡ 11 (mod 7).. the quality or state of corresponding, agreeing, or being congruent. 2. (Mathematics) maths the relationship between two integers, x and y, such that their difference, with respect to another positive integer called the modulus, n, is a multiple of the modulus. Usually written x â¡ y (mod n), as in 25 â¡ 11 (mod 7).