Congruence means compatibility. If you've been studying French, you might be glad to note, when learning Spanish, that there are many areas of congruence in grammar and vocabulary between the two Romance languages.
In geometry, shapes are congruent when they are exactly the same, such as squares with three-inch sides. In a more general context, congruent means "in agreement with," as in "the school's rules are congruent with expectations for behavior at home."
