Relating to knowledge or reasoning that is independent of experience; based on theoretical deduction rather than empirical observation. Known or existing before experience.
From Latin 'a priori' meaning 'from what is before,' literally 'from the former.' Used in medieval philosophy to distinguish logical reasoning from experiential knowledge.
Remember 'A PRIORI' = 'Before experience' - you know it PRIOR to observing! Think 'prior' (before) - this knowledge comes before you need to test it. Math is a priori: 2+2=4 without needing experiments!
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