👉 In mathematics, a term that means "not at all" or "nonequally" is called an "equivalence class." It is a set of elements that are considered equivalent in some sense to each other. For example, if we have two sets A and B, then the equivalence classes for A ∩ B would be the union of all the subsets of A and B with respect to their intersection (A ∩ B = A ∪ B).
