A logical proof or demonstration that is beyond doubt, used especially in ancient Greek philosophy to establish absolute truth.
From Ancient Greek apodeixis (ἀπόδειξις), from apo- (away, from) + deikn- (to show), meaning literally 'a showing forth.' The term evolved through Greek logic to denote conclusive demonstration.
Aristotle used apodixis as the gold standard of proof—not just showing something is true, but proving it must be true in all possible circumstances, which is why it became foundational to how we think about logical certainty today.
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