from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A valid form of argument in which the consequent of a conditional proposition is denied, thus implying the denial of the antecedent. Modus tollens has this form:


From modus tollendō tollēns ("the mode where the denying denies"), from modus ("mode") and forms of tollō ("I deny"). (Wiktionary)


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