• WordNet 3.6
    • adj Leibnitzian of or relating to Gottfried Wilhelm Leibniz or to his mathematics or philosophy
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Century Dictionary and Cyclopedia
    • leibnitzian Belonging, due, or according to the German philosopher and mathematician Gottfried Wilhelm Leibnitz (1646–1716). In philosophy Leibnitz taught the doctrine of monads, the identity of indiscernibles, the law of continuity, preëstablished harmony, the doctrine of vis viva, innate ideas, a universal characteristic, the principle of sufficient reason, theism, optimism, etc. He and Newton were independent inventors of the differential and integral calculus, but the name, notation, etc., which have prevailed are those of Leibnitz.
    • n leibnitzian A follower of Leibnitz; in mathematics, an early student of the infinitesimal calculus.
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Chambers's Twentieth Century Dictionary
    • adj Leibnitzian līb-nit′zi-an pertaining to the great German philosopher and mathematician, Gottfried Wilhelm Leibnitz (1646-1716)
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In literature:

I am quite well satisfied with the latter part of this opinion of the philosophers of the Leibnitzian school.
"The Critique of Pure Reason" by Immanuel Kant
On another side Kant had been shaking himself free from the principles of the Leibnitzian philosophy.
"Encyclopaedia Britannica, 11th Edition, Volume 15, Slice 6" by Various