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a priori / a posteriori

Title page of the Critique of Pure Reason (1781)
Image: © Foto H.-P.Haack · CC BY-SA 3.0 · Wikimedia Commons

A priori knowledge is independent of all experience (e.g. mathematics); a posteriori knowledge derives from experience.

The distinction is the foundation of the “Critique of Pure Reason”. Kant's guiding question: how are synthetic judgments a priori possible — judgments that extend our knowledge and yet hold necessarily, such as “7 + 5 = 12” or “everything that happens has a cause”?

His answer: such judgments are possible because they concern the forms that our own cognitive faculty imposes on all experience — space, time and the categories.

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Where it appears

Source: Wikipedia: a priori / a posteriori