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[ih-rash-uh-nal-i-tee] /ɪˌræʃ əˈnæl ɪ ti/
noun, plural irrationalities for 2.
the quality or condition of being irrational.
an irrational, illogical, or absurd action, thought, etc.
Origin of irrationality
1560-70; irrational + -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for irrationality
Contemporary Examples
Historical Examples
  • But machines could not hope to encompass all the irrationality of Man.

    Mezzerow Loves Company Floyd L. Wallace
  • Elsmere's irrationality was an aversion to doctors, from the point of view of his own ailments.

    Robert Elsmere Mrs. Humphry Ward
  • Much that is absurd is found in man's religion, but the Tibetan form of it seemed to me the very ne plus ultra of irrationality.

  • This is the fifth example of irrationality and incommensurability.

    The Way To Geometry Peter Ramus
  • Philosophizing on the irrationality of old people, she proceeded to get enough scarcely-ripe peaches for a deep-dish pie.

    Missy Dana Gatlin
British Dictionary definitions for irrationality


the state or quality of being irrational
irrational thought, action, or behaviour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for irrationality

1560s, from irrational + -ity.

Online Etymology Dictionary, © 2010 Douglas Harper
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