[ rash-uh-nal-i-tee ]
See synonyms for rationality on Thesaurus.com
noun,plural ra·tion·al·i·ties.
  1. the state or quality of being rational.

  2. the possession of reason.

  1. agreeableness to reason; reasonableness.

  2. the exercise of reason.

  3. 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

Other words from rationality

  • an·ti·ra·tion·al·i·ty, noun, adjective
  • non·ra·tion·al·i·ty, noun

Words Nearby rationality

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use rationality in a sentence

British Dictionary definitions for rationality


/ (ˌræʃəˈnælɪtɪ) /

nounplural -ties
  1. the state or quality of being rational or logical

  2. the possession or utilization of reason or logic

  1. a reasonable or logical opinion

  2. 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