irrationalityn.

/ɪraʃəˈnalɪti/

Etymology: < irrational adj. and n. + -ity suffix.

1. The quality of being devoid of reason.

ΘΚΠ

the mind > mental capacity > lack of understanding > lack of reason, irrationality > [noun]

unskillc1380

unreasona1400

unreasonableness1598

reasonlessness1622

irrationability1645

alogy1646

irrationality1822

non-rationality1894

non-reason1898

stupid1948

1822 J. M. Good Study Med. III. 190 Mória Demens. Witlessness. Irrationality.

1874 W. B. Carpenter Princ. Mental Physiol. (1879) i. ii. §59 60 The irrationality of the impulse which prompts the Bees to this action, is evidenced by its occasional performance under circumstances which, if they could reason, would have shown them that it must be ineffective.

a. The quality of not being guided by, or not being in accordance with, reason; absurdity of thought or action.

ΘΚΠ

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

wantonnessc1405

absurdity1529

monstruousness1545

impertinency1573

ridiculousness1573

monstrousness1574

absurd1581

absurdness1582

incongruity1597

fancy1598

delirium1599

monstruosity1604

absurdum1606

foppishness1611

impertinence1616

nonsense1630

impertinentness1645

irrationality1647

monstrosity1651

nonsensicality1652

ridicule1668

ridicule1672

nonsensicalness1674

maggotry1706

preposterousness1727

zanyship1766

ridiculosity1773

drollness1823

stultification1832

nonsensity1834

farcicality1849

cockeyedness1858

1647 R. Boyle Let. 3 May in Wks. (1772) I. p. xl Like Jonah's gourd, smitten at the root with the worm of their irrationality.

1662 A. Mervyn Speech to Duke of Ormond 37 It were to impose too much irrationality on our Law.

1717 Lady M. W. Montagu Let. 12 Feb. (1965) I. 305 Nothing seems to me a plainer proofe of the irrationality of Mankind..than the rage with which they contest for a small spot of Ground.

1863 C. C. Clarke Shakespeare-characters vii. 185 That strange mixture of cunning, and love of stratagem, with irrationality in the contrivance, so remarkable in insane people.

1866 ‘G. Eliot’ Felix Holt II. xxxiii. 285 Some sharp-visaged men who loved the irrationality of riots.

b. An irrational thing, action, or thought; an absurdity.

ΘΚΠ

the mind > mental capacity > lack of understanding > lack of reason, irrationality > [noun] > irrational thing, action, etc.

irrationalitya1680

unreason1824

non-rational1893

arational1972

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

follyc1300

absurditya1525

mumpsimus1531

trim-tram1533

foppery1546

ridicle1570

fangle1583

delirium1599

monstruosity1601

adox1606

absurd1610

extravagancy1625

incongruitya1626

monstrosity1639

extravagant1644

extravagance1650

ridiculea1658

fadoodlea1670

ridiculous1674

irrationalitya1680

ridiculosity1773

whimsy-whamsy1807

absurdism1815

nonsensity1834

nonsensical1842

nonsensicalitya1850

fandango1856

fandangle1880

bollock1919

a1680 S. Charnock Several Disc. Existence of God (1682) 14 To..forge irrationalities for the support of his fancy.

1853 T. De Quincey Judas Iscariot in Hogg's Instructor New Ser. 10 340/2 A dismal heap of irrationalities.

3. Mathematics. The quality of being irrational: see irrational adj. 3.

ΘΚΠ

the world > relative properties > number > mathematical number or quantity > [noun] > particular qualities > irrational

surd1557

irrationality1570

irrationala1690

heterogeneous1728

transcendence1902

1570 J. Dee in H. Billingsley tr. Euclid Elements Geom. Math. Præf. sig. *ij Practise hath led Numbers farder..to take vpon them, the shew of Magnitudes propertie: Which is Incommensurabilitie and Irrationalitie.

1839 H. Hallam Introd. Lit. Europe II. viii. 444 Pelletier does not employ the signs + and −,..but we find the sign √ of irrationality.

4. Optics. The inequality of the ratios of the dispersion of the various colours in spectra produced by refraction through different substances.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > light > chromatism > [noun] > spectrum > inequality

irrationality1797

1797 Encycl. Brit. at Telescope The effect of this irrationality (so to call it) of dispersion, will appear plainly.

1829 Nat. Philos. (Libr. Useful Knowl.) I. Optics ix. 26 Hence the coloured spaces have not the same ratio to each other as the lengths of the spectrum; and therefore this property is called the irrationality of dispersion, or of the coloured spaces in the spectrum.

1867 W. R. Grove On Correlation Physical Forces (ed. 5) 293 The irrationality of the spectrum or the incommensurate divisions of the spectra formed by flint and crown glass.

5. Ancient Greek Prosody. See irrational adj. 4.

ΘΚΠ

society > leisure > the arts > literature > poetry > versification > rhythm > [noun] > quantity > disagreement of metrical and normal length

false quantity1711

irrationality1844

1844 C. Beck & C. C. Felton tr. E. Munk Metres Greeks & Romans 17 Irrationality takes place in the double kind in the thesis, in the equal in the arsis.

This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2018).

单词	irrationality
释义	irrationalityn. /ɪraʃəˈnalɪti/ Etymology: < irrational adj. and n. + -ity suffix. 1. The quality of being devoid of reason. ΘΚΠ the mind > mental capacity > lack of understanding > lack of reason, irrationality > [noun] unskillc1380 unreasona1400 unreasonableness1598 reasonlessness1622 irrationability1645 alogy1646 irrationality1822 non-rationality1894 non-reason1898 stupid1948 1822 J. M. Good Study Med. III. 190 Mória Demens. Witlessness. Irrationality. 1874 W. B. Carpenter Princ. Mental Physiol. (1879) i. ii. §59 60 The irrationality of the impulse which prompts the Bees to this action, is evidenced by its occasional performance under circumstances which, if they could reason, would have shown them that it must be ineffective. 2. a. The quality of not being guided by, or not being in accordance with, reason; absurdity of thought or action. ΘΚΠ the mind > mental capacity > lack of understanding > foolishness, folly > absurdity, incongruity > [noun] wantonnessc1405 absurdity1529 monstruousness1545 impertinency1573 ridiculousness1573 monstrousness1574 absurd1581 absurdness1582 incongruity1597 fancy1598 delirium1599 monstruosity1604 absurdum1606 foppishness1611 impertinence1616 nonsense1630 impertinentness1645 irrationality1647 monstrosity1651 nonsensicality1652 ridicule1668 ridicule1672 nonsensicalness1674 maggotry1706 preposterousness1727 zanyship1766 ridiculosity1773 drollness1823 stultification1832 nonsensity1834 farcicality1849 cockeyedness1858 1647 R. Boyle Let. 3 May in Wks. (1772) I. p. xl Like Jonah's gourd, smitten at the root with the worm of their irrationality. 1662 A. Mervyn Speech to Duke of Ormond 37 It were to impose too much irrationality on our Law. 1717 Lady M. W. Montagu Let. 12 Feb. (1965) I. 305 Nothing seems to me a plainer proofe of the irrationality of Mankind..than the rage with which they contest for a small spot of Ground. 1863 C. C. Clarke Shakespeare-characters vii. 185 That strange mixture of cunning, and love of stratagem, with irrationality in the contrivance, so remarkable in insane people. 1866 ‘G. Eliot’ Felix Holt II. xxxiii. 285 Some sharp-visaged men who loved the irrationality of riots. b. An irrational thing, action, or thought; an absurdity. ΘΚΠ the mind > mental capacity > lack of understanding > lack of reason, irrationality > [noun] > irrational thing, action, etc. irrationalitya1680 unreason1824 non-rational1893 arational1972 the mind > mental capacity > lack of understanding > foolishness, folly > absurdity, incongruity > [noun] > instance of follyc1300 absurditya1525 mumpsimus1531 trim-tram1533 foppery1546 ridicle1570 fangle1583 delirium1599 monstruosity1601 adox1606 absurd1610 extravagancy1625 incongruitya1626 monstrosity1639 extravagant1644 extravagance1650 ridiculea1658 fadoodlea1670 ridiculous1674 irrationalitya1680 ridiculosity1773 whimsy-whamsy1807 absurdism1815 nonsensity1834 nonsensical1842 nonsensicalitya1850 fandango1856 fandangle1880 bollock1919 a1680 S. Charnock Several Disc. Existence of God (1682) 14 To..forge irrationalities for the support of his fancy. 1853 T. De Quincey Judas Iscariot in Hogg's Instructor New Ser. 10 340/2 A dismal heap of irrationalities. 3. Mathematics. The quality of being irrational: see irrational adj. 3. ΘΚΠ the world > relative properties > number > mathematical number or quantity > [noun] > particular qualities > irrational surd1557 irrationality1570 irrationala1690 heterogeneous1728 transcendence1902 1570 J. Dee in H. Billingsley tr. Euclid Elements Geom. Math. Præf. sig. ij Practise hath led Numbers farder..to take vpon them, the shew of Magnitudes propertie: Which is Incommensurabilitie and Irrationalitie. 1839 H. Hallam Introd. Lit. Europe* II. viii. 444 Pelletier does not employ the signs + and −,..but we find the sign √ of irrationality. 4. Optics. The inequality of the ratios of the dispersion of the various colours in spectra produced by refraction through different substances. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > chromatism > [noun] > spectrum > inequality irrationality1797 1797 Encycl. Brit. at Telescope The effect of this irrationality (so to call it) of dispersion, will appear plainly. 1829 Nat. Philos. (Libr. Useful Knowl.) I. Optics ix. 26 Hence the coloured spaces have not the same ratio to each other as the lengths of the spectrum; and therefore this property is called the irrationality of dispersion, or of the coloured spaces in the spectrum. 1867 W. R. Grove On Correlation Physical Forces (ed. 5) 293 The irrationality of the spectrum or the incommensurate divisions of the spectra formed by flint and crown glass. 5. Ancient Greek Prosody. See irrational adj. 4. ΘΚΠ society > leisure > the arts > literature > poetry > versification > rhythm > [noun] > quantity > disagreement of metrical and normal length false quantity1711 irrationality1844 1844 C. Beck & C. C. Felton tr. E. Munk Metres Greeks & Romans 17 Irrationality takes place in the double kind in the thesis, in the equal in the arsis. This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2018). < n.1570
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