A contradiction between two laws, principles, or statements that seem equally valid; a paradox where two things can't both be true but seem to be.
From Greek anti- (against) + nomos (law). Philosophical term used since ancient times to describe fundamental logical contradictions.
The most mind-bending antinomies involve infinity—like 'is the universe infinite or finite?' Both seem impossible, yet one must be true, which is why cosmologists still argue about it!
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