"reductio ad absurdum" meaning in English

See reductio ad absurdum in All languages combined, or Wiktionary

Noun

Forms: reductio ad absurdums [plural]
Etymology: Unadapted borrowing from Latin reductiō ad absurdum. Etymology templates: {{ubor|en|la|reductiō ad absurdum}} Unadapted borrowing from Latin reductiō ad absurdum Head templates: {{en-noun|-|+|nolinkhead=1}} reductio ad absurdum (usually uncountable, plural reductio ad absurdums)
  1. (mathematics, logic) The method of disproving a statement by assuming the statement is true and, with that assumption, arriving at a blatant contradiction. Tags: uncountable, usually Categories (topical): Logic, Mathematics Synonyms: apagoge, proof by contradiction, reduction to the absurd Derived forms: reductio ad Hitlerum, reductio ad Stalinum
    Sense id: en-reductio_ad_absurdum-en-noun-m28TnBB2 Categories (other): English entries with incorrect language header, Pages with 2 entries, Pages with entries Topics: human-sciences, logic, mathematics, philosophy, sciences

Inflected forms

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          "ref": "1894, Flora Helm, “Concerns a Talk in Which Anarchy and Love Are Blended”, in Between Two Forces: A Record of a Theory and a Passion, Boston, Mass.: Arena Publishing Company. […], pages 149–150:",
          "text": "“You, gentlemen, as representatives of that institution which recognizes only truths that are deduced from reductio ad absurdums will probably have no difficulty in perceiving the truth of this absurdity and hence be ready to excuse the outcome of it—my absence.”",
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          "ref": "1998, Mark H. Bickhard, “Constructivisms and Relativisms: A Shopper’s Guide”, in Michael R[obert] Matthews, editor, Constructivism in Science Education: A Philosophical Examination, Dordrecht, Boston, Mass., London: Kluwer Academic Publishers, →ISBN, page 106:",
          "text": "Constructing representations out of atoms that are already themselves representations cannot address the origins of the atoms per se. Careful pursuit of such approaches has yielded bizarre reductio ad absurdums such as the implication that virtually all concepts that human beings are capable of having are already in the genes.",
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          "ref": "2009, Michael S. Moore, “Normative Problems in Applying the Harm-within-the-Risk Test to Crimes/Torts of Negligence”, in Causation and Responsibility: An Essay in Law, Morals, and Metaphysics, Oxford University Press, published 2010, →ISBN, section III (The First Blind Alley: The Attempt to Replace Proximate Causation with Culpability as a Prerequisite for Legal Liability), page 208:",
          "text": "One way to argue against a position is to demonstrate that it proves too much. Proponents of an HWR analysis of negligence may insist that the conceptual and normative arguments that have been directed against their project ultimately generate reductio ad absurdums suggesting that I have proved too much.",
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        "(mathematics, logic) The method of disproving a statement by assuming the statement is true and, with that assumption, arriving at a blatant contradiction."
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          "word": "apagoge"
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          "word": "proof by contradiction"
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          "word": "reduction to the absurd"
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  "word": "reductio ad absurdum"
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        "(mathematics, logic) The method of disproving a statement by assuming the statement is true and, with that assumption, arriving at a blatant contradiction."
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This page is a part of the kaikki.org machine-readable English dictionary. This dictionary is based on structured data extracted on 2025-03-21 from the enwiktionary dump dated 2025-03-02 using wiktextract (db0bec0 and 633533e). The data shown on this site has been post-processed and various details (e.g., extra categories) removed, some information disambiguated, and additional data merged from other sources. See the raw data download page for the unprocessed wiktextract data.

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