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Definition of a priori: 1. Applied to knowledge and conceptions assumed, or presupposed, as prior to experience, in order to make experience rational or possible.
2. Characterizing that kind of reasoning which deduces consequences from definitions formed, or principles assumed, or which infers effects from causes previously known; deductive or deductively. The reverse of a posteriori.

Synonyms:

inferential, primordial, derivable, reasoned, sine die, original, transcendental, a fortiori, deducible, sub judice, intuitive, bona fides, pro bono, theoretical, de jure, transcendent, theoretic, a posteriori, inferable, force majeure