Obversion
"Obversion" in a Sentence (2 examples)
All men are mortal, so, by obversion, no men are immortal.
From 'warmth is agreeable' we can affirm, by formal obversion, 'warmth is not disagreeable, and not indifferent.' We cannot affirm, without an examination of the subject matter, 'cold is disagreeable.'
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.