Harmoniously joined or related; agreeing; corresponding; appropriate.In mathematics, in the relation of congruence: thus, one number is said to be congruent to another relatively to a third, called the modulus, when the first two numbers on being divided by the modulus give the same remainder.In logic, predicable of the same subject, as terms, or true of the same state of things, as propositions.Tn grammar, accordant; agreeing.In geometry, identical in shape and size.