congruence

noun6

1. •
   The quality of agreeing or corresponding; being suitable and appropriate.
2. •
   A well-adjusted state or condition in which people are not lying to themselves or in denial.
3. •
   The quality of being isometric — roughly, the same measure and shape.
4. •
   A relation between two numbers indicating they give the same remainder when divided by some given number.
5. •
   Any equivalence relation defined on an algebraic structure which is preserved by operations defined by the structure.
6. •
   Matrix similarity by an orthogonal matrix.