Belonging, due, or according to the German philosopher and mathematician Gottfried Wilhelm Leibnitz (1646–1716).

noun. A follower of Leibnitz; in mathematics, an early student of the infinitesimal calculus.

adjective. of or relating to Gottfried Wilhelm Leibniz or to his mathematics or philosophy

"Fechner tries sincerely to grapple with the problem of evil, but he always solves it in the leibnitzian fashion by making his God non-absolute, placing him under conditions of 'metaphysical necessity' which even his omnipotence cannot violate."