A priori and a posteriori

A priori (‘from the earlier’) and a posteriori (‘from the later’) are Latin phrases used in philosophy and linguistics to distinguish types of knowledge, justification, or argument by their reliance on experience. Roughly speaking, a proposition is known or justified a priori if it is known or justified independently of any experience (beyond the experience necessary to understand the proposition); instead, it is known or justified a posteriori if its knowledge and/or justification depends on empirical evidence.

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