CORRELATIVE generally denotes the terms or partners of a relationship. A relationship requires at least two terms be tween which it holds, and they are said to be correlative terms. Thus, e.g., "cause" and "effect" exemplify one kind of relation ship, "teacher" and "pupil" another, "north" and "south" yet another relationship. The terms in each of these pairs are accord ingly called, in logic, "correlative" terms. The expression has also been extended to propositions which express the same relationship from different points of view. Thus, e.g., S is North of P implies P is South of S. They are simply correlative propositions.
See A. Wolf, Essentials of Logic (1926).