ra·​tio·​nal·​i·​ty | \ ˌra-shə-ˈna-lə-tē How to pronounce rationality (audio) \
plural rationalities

Definition of rationality

1 : the quality or state of being rational
2 : the quality or state of being agreeable to reason : reasonableness
3 : a rational opinion, belief, or practice usually used in plural

Examples of rationality in a Sentence

Recent Examples on the Web Mercury, a planet that's known for impacting communication, rationality, and reasoning, is inching its way from Aries into Taurus on 19th April — the very same day Taurus season begins. Elizabeth Gulino, refinery29.com, 18 Apr. 2021 In the semiconductor world, the job of restoring rationality to the supply chain falls to the foundries. Nicolás Rivero, Quartz, 5 May 2021 Even a country like France that prided themselves in the 18th Century on rationality is the most anti-vaccine country in Western democracy. Jason Newman, Rolling Stone, 13 Apr. 2021 The Matrix is not actually a metaphor for waking up to the supposed rationality of misogyny, but an allegory of gender dysphoria, as its creators have repeatedly said. Kaitlyn Tiffany, The Atlantic, 13 Apr. 2021 Washington isn’t a city particularly known for its rationality. Philip Elliott, Time, 25 Mar. 2021 Though not enough, fortunately, to diminish her rationality, her courage, her sense of obligation to seek justice for a woman so treated. Dorothy Rabinowitz, WSJ, 4 Mar. 2021 In both cases, intelligence and rationality are championed as the ultimate validations, while stupidity and insanity are the ultimate put-downs. Andrew Pulrang, Forbes, 24 Feb. 2021 Better, perhaps, to inject some rationality into the event, especially as the Brood X cicada relates to our yards and gardens. Washington Post, 31 Mar. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'rationality.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of rationality

1628, in the meaning defined at sense 1

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Time Traveler for rationality

Time Traveler

The first known use of rationality was in 1628

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Statistics for rationality

Last Updated

3 Jun 2021

Cite this Entry

“Rationality.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rationality. Accessed 15 Jun. 2021.

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More Definitions for rationality


ra·​tio·​nal·​i·​ty | \ ˌrash-ə-ˈnal-ət-ē How to pronounce rationality (audio) \
plural rationalities

Medical Definition of rationality

1 : the quality or state of being rational
2 : the quality or state of being agreeable to reason


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