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noun, plural ra·tion·al·i·ties.
  1. the state or quality of being rational.
  2. the possession of reason.
  3. agreeableness to reason; reasonableness.
  4. the exercise of reason.
  5. a reasonable view, practice, etc.

Origin of rationality

First recorded in 1560–70, rationality is from the Late Latin word ratiōnālitās reasonableness. See rational, -ity
Related formsan·ti·ra·tion·al·i·ty, noun, adjectivenon·ra·tion·al·i·ty, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for rationality


noun plural -ties
  1. the state or quality of being rational or logical
  2. the possession or utilization of reason or logic
  3. a reasonable or logical opinion
  4. 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

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