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[rash-uh-nal-i-tee] /ˌræʃ əˈnæl ɪ ti/
noun, plural rationalities.
the state or quality of being rational.
the possession of reason.
agreeableness to reason; reasonableness.
the exercise of reason.
a reasonable view, practice, etc.
Origin of rationality
1560-70; < Late Latin ratiōnālitās reasonableness. See rational, -ity
Related forms
antirationality, noun, adjective
nonrationality, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for rationality
  • What binds them is a commitment to logic and rationality.
  • Logic and rationality might contribute a bit to these questions but cannot answer them.
  • Therefore, our decisions must be tempered by logic, rationality and intelligence.
  • They'll never listen if you try logic and rationality- perhaps better to go after them using their own weapons.
  • As a result, maybe rationality has been devalued simply because it is no longer considered a unique human specialty.
  • Economists have tended to content themselves with a laughably simple picture of human motivation, rationality and well-being.
  • They would tend to play games in which rationality helps, such as blackjack or poker.
  • First, it was a reminder that politics often trumps rationality.
  • Our left brain is what goes about speech and rationality.
  • Economists, with their strong faith in rationality and liberty, have tended to agree.
British Dictionary definitions for rationality


noun (pl) -ties
the state or quality of being rational or logical
the possession or utilization of reason or logic
a reasonable or logical opinion
(economics) the assumption that an individual will compare all possible combinations of goods and their prices when making purchases
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 rationality

1620s, "quality of having reason;" 1650s, "fact of being agreeable to reason," from French rationalité, from Late Latin rationalitas "reasonableness, rationality" (also source of Spanish racionalidad, Italian razionalita), from Latin rationalis (see rational).

Online Etymology Dictionary, © 2010 Douglas Harper
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