congruence (plural congruences)

  1. The quality of agreeing or corresponding; being suitable and appropriate.
  2. (mathematics, number theory) A relation between two numbers indicating they give the same remainder when divided by some given number.
  3. (mathematics, geometry) The quality of being isometric — roughly, the same measure and shape.
  4. (algebra) More generally: any equivalence relation defined on an algebraic structure which is preserved by operation defined by the structure.
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