[ rash-uh-nal-i-tee ]
/ ˌræʃ əˈnæl ɪ ti /

noun, plural ra·tion·al·i·ties.

the state or quality of being rational.
the possession of reason.
agreeableness to reason; reasonableness.
the exercise of reason.
a reasonable view, practice, etc.

Nearby words

  1. rational-emotive therapy,
  2. rationale,
  3. rationalise,
  4. rationalism,
  5. rationalist,
  6. rationalization,
  7. rationalize,
  8. rationally,
  9. rationing,
  10. rations

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. 2019

Examples from the Web for rationality

British Dictionary definitions for rationality


/ (ˌræʃəˈnælɪtɪ) /

noun plural -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

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