A statement or argument that contradicts or opposes another proposition.
From counter- + proposition (from Latin propositio, a statement). Logical and philosophical term used since the 17th century in formal debates.
In formal logic, a counterproposition doesn't just disagree—it specifically states the opposite as a logical statement, and sometimes both can be 'true' in different systems (like Euclidean vs. non-Euclidean geometry).
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