reductio ad absurdumn.

Brit.

/rᵻˌdʌktɪəʊ ad əbˈsəːdəm/,

/rᵻˌdʌktɪəʊ ad abˈsəːdəm/, U.S.

/rəˈˌdəkʃioʊ æd əbˈsərdəm/,

/riˈˌdəkʃioʊ æd əbˈsərdəm/,

/rəˈdəktioʊ æd əbˈsərdəm/,

/riˈdəktioʊ æd əbˈsərdəm/

Inflections: Plural reductiones ad absurdum /rɪdʌktɪˈəʊniːz/, reductio ad absurdums, reductios ad absurdum, (rare) reductii ad absurdum.

Forms: 1700s– reductio ad absurdum, 1900s– reductia ad absurdum (irregular), 1900s– reductii ad absurdum (irregular).

Origin: A borrowing from Latin. Etymons: Latin reductiō, ad, absurdum, absurdus.

Etymology: < classical Latin reductiō reduction n. + ad to + absurdum, use as noun of neuter of absurdus absurd adj., probably representing an alteration of post-classical Latin deductio ad absurdum (see ad absurdum adv.). Compare reductio ad impossibile n. and later reductio ad absurdissimum n., and compare also reduction to the absurd at reduction n. 10b.Various other equivalent Latin expressions are also found in English texts in the 17th cent.: see ad absurdum adv. Compare also:a1640 T. Jackson Μαραν Αθα (1657) 3456 The Inferences made by our Apostle are radically and generally Two. The One Negative,Per Reductionem ad impossibile, aut absurdum: The other Affirmative, by Positive Proof.

The practice of demonstrating the falsity of a hypothesis, principle, etc., by showing that the consequence of assuming it to be true is something absurd or contradictory; an instance of this; = reduction to the absurd at reduction n. 10b. Also in extended use: the action or an act of carrying something to an absurd extreme.

ΘΚΠ

the mind > mental capacity > lack of understanding > foolishness, folly > absurdity, incongruity > [noun] > reduction to absurdity

reduction to the absurd (also to absurdity)1712

reductio ad absurdum1730

1659 O. Walker Some Instr. Art of Oratory i. 6 Suppositions and Reduction ad absurdum, are diligently to be sought out.]

1730 N. Bailey Dict. Britannicum Exhaustions, a way of proving the equality of two magnitudes by a reductio ad absurdum; shewing that if one be supposed either greater or less than the other, there will arise a contradiction.

1741 I. Watts Improvem. Mind i. xiii. 181 The Respondent may be attack'd either upon a Point of his own Concession, which is call'd Argumentum ex concessis, or by reducing him to an Absurdity, which is call'd Reductio ad absurdum.

1824 J. S. Mill in Westm. Rev. 2 34 This we admit: and we regard it as a decisive reductio ad absurdum of his own argument.

1844 Times 29 Jan. 4/3 It would have been the greatest reductio ad absurdum of trial by jury that we can conceive.

1874 R. Brown Man. Bot. iii. i. 287 To apply a separate name to a thicker or thinner portion of the same organ, and then a separate name to the organ (or in the case of a fruit) so shaped, is the reductio ad absurdum of name-making.

1925 G. K. Chesterton Everlasting Man ii. ii. 211 The argument which is meant to be the backbone of the book is of the kind called the reductio ad absurdum.

1969 L. Ruby Art of making Sense (rev. ed.) viii. 84 Here is a more complex sample of the reductio ad absurdum.

1976 Times Lit. Suppl. 3 Dec. 1522/4 Whether the result represents anything more than a reductio ad absurdum of the traditional musicological pastime of theme-spotting.

2001 C. Kelly Russ. Lit. iv. 75 Venedikt Erofeev's Moscow-Petushki was a reductio ad absurdum of the official practice of using citations from the classics as a way of displaying a text's cultural credentials.

This entry has been updated (OED Third Edition, September 2009; most recently modified version published online March 2022).

单词	reductio ad absurdum
释义	reductio ad absurdumn. Brit. /rᵻˌdʌktɪəʊ ad əbˈsəːdəm/, /rᵻˌdʌktɪəʊ ad abˈsəːdəm/, U.S. /rəˈˌdəkʃioʊ æd əbˈsərdəm/, /riˈˌdəkʃioʊ æd əbˈsərdəm/, /rəˈdəktioʊ æd əbˈsərdəm/, /riˈdəktioʊ æd əbˈsərdəm/ Inflections: Plural reductiones ad absurdum /rɪdʌktɪˈəʊniːz/, reductio ad absurdums, reductios ad absurdum, (rare) reductii ad absurdum. Forms: 1700s– reductio ad absurdum, 1900s– reductia ad absurdum (irregular), 1900s– reductii ad absurdum (irregular). Origin: A borrowing from Latin. Etymons: Latin reductiō, ad, absurdum, absurdus. Etymology: < classical Latin reductiō reduction n. + ad to + absurdum, use as noun of neuter of absurdus absurd adj., probably representing an alteration of post-classical Latin deductio ad absurdum (see ad absurdum adv.). Compare reductio ad impossibile n. and later reductio ad absurdissimum n., and compare also reduction to the absurd at reduction n. 10b.Various other equivalent Latin expressions are also found in English texts in the 17th cent.: see ad absurdum adv. Compare also:a1640 T. Jackson Μαραν Αθα (1657) 3456 The Inferences made by our Apostle are radically and generally Two. The One Negative,Per Reductionem ad impossibile, aut absurdum: The other Affirmative, by Positive Proof. The practice of demonstrating the falsity of a hypothesis, principle, etc., by showing that the consequence of assuming it to be true is something absurd or contradictory; an instance of this; = reduction to the absurd at reduction n. 10b. Also in extended use: the action or an act of carrying something to an absurd extreme. ΘΚΠ the mind > mental capacity > lack of understanding > foolishness, folly > absurdity, incongruity > [noun] > reduction to absurdity reduction to the absurd (also to absurdity)1712 reductio ad absurdum1730 1659 O. Walker Some Instr. Art of Oratory i. 6 Suppositions and Reduction ad absurdum, are diligently to be sought out.] 1730 N. Bailey Dict. Britannicum Exhaustions, a way of proving the equality of two magnitudes by a reductio ad absurdum; shewing that if one be supposed either greater or less than the other, there will arise a contradiction. 1741 I. Watts Improvem. Mind i. xiii. 181 The Respondent may be attack'd either upon a Point of his own Concession, which is call'd Argumentum ex concessis, or by reducing him to an Absurdity, which is call'd Reductio ad absurdum. 1824 J. S. Mill in Westm. Rev. 2 34 This we admit: and we regard it as a decisive reductio ad absurdum of his own argument. 1844 Times 29 Jan. 4/3 It would have been the greatest reductio ad absurdum of trial by jury that we can conceive. 1874 R. Brown Man. Bot. iii. i. 287 To apply a separate name to a thicker or thinner portion of the same organ, and then a separate name to the organ (or in the case of a fruit) so shaped, is the reductio ad absurdum of name-making. 1925 G. K. Chesterton Everlasting Man ii. ii. 211 The argument which is meant to be the backbone of the book is of the kind called the reductio ad absurdum. 1969 L. Ruby Art of making Sense (rev. ed.) viii. 84 Here is a more complex sample of the reductio ad absurdum. 1976 Times Lit. Suppl. 3 Dec. 1522/4 Whether the result represents anything more than a reductio ad absurdum of the traditional musicological pastime of theme-spotting. 2001 C. Kelly Russ. Lit. iv. 75 Venedikt Erofeev's Moscow-Petushki was a reductio ad absurdum of the official practice of using citations from the classics as a way of displaying a text's cultural credentials. This entry has been updated (OED Third Edition, September 2009; most recently modified version published online March 2022). < n.1730
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