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1. Dictionary

   Ra·tion·al

   /ˈraSH(ə)nəl/

   

   adjective

   • 1. based on or in accordance with reason or logic: "I'm sure there's a perfectly rational explanation" Similar logicalreasonedwell reasonedsensiblereasonablecogentcoherentintelligentwisejudicioussagaciousastuteshrewdperceptiveenlightenedclear-eyedclear-sightedcommonsensicalcommon-sensewell advisedwell groundedsoundsoberprudentcircumspectpoliticdown-to-earthpracticalpragmaticmatter-of-facthardheadedwith both one's feet on the groundunidealisticinformal:joined-upOpposite irrationalillogical
   • ▪ (of a person) able to think clearly, sensibly, and logically: "Andrea's upset—she's not being very rational" Similar lucidcoherentsanein one's right mindable to think/reason clearlyof sound mindin possession of all one's facultiesnormalbalancedwell balancedclearheadedcompos mentisinformal:all thereOpposite insane
   • ▪ endowed with the capacity to reason: "man is a rational being" Similar intelligentthinkingdiscriminatingreasoningcognitivementalcerebrallogicalanalyticalconceptualrare:ratiocinative
   • 2. (of a number, quantity, or expression) expressible, or containing quantities that are expressible, as a ratio of whole numbers. When expressed as a decimal, a rational number has a finite or recurring expansion.

   noun

   • 1. a rational number.

   Word Origin late Middle English (in the sense ‘having the ability to reason’): from Latin rationalis, from ratio(n-) ‘reckoning, reason’ (see ratio).

   Scrabble Points: 8

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2. www.merriam-webster.com › dictionary › rationalRational Definition & Meaning - Merriam-Webster

   www.merriam-webster.com › dictionary › rational

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   1. a. : having reason or understanding. b. : relating to, based on, or agreeable to reason : reasonable. a rational explanation. rational behavior. 2. : involving only multiplication, division, addition, and subtraction and only a finite number of times. 3. : relating to, consisting of, or being one or more rational numbers.

3. dictionary.cambridge.org › dictionary › englishRATIONAL | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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   adjective. us / ˈræʃ·ə·n ə l / Add to word list. showing clear thought or reason: a rational decision. Obviously, he wasn’t rational. rationally. adverb [ not gradable ] us / ˈræʃ·ə·n ə l·i / It’s hard to behave rationally at such times. (Definition of rational from the Cambridge Academic Content Dictionary © Cambridge University Press)

4. www.vocabulary.com › dictionary › rationalRational - Definition, Meaning & Synonyms | Vocabulary.com

   www.vocabulary.com › dictionary › rational

   Use the adjective rational to describe people or ideas that operate according to logic or reason. While your brother has an artistic temperament, you have a rational one. Rational comes from the Latin word rationalis, meaning reasonable or logical.

5. dictionary.cambridge.org › rationalRATIONAL | meaning - Cambridge Learner's Dictionary

   dictionary.cambridge.org › rational

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   RATIONAL definition: 1. based on facts and not affected by someone's emotions or imagination: 2. able to make decisions…. Learn more.

6. www.thefreedictionary.com › rationalRational - definition of rational by The Free Dictionary

   www.thefreedictionary.com › rational

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   rational. ( ˈræʃənəl) adj. 1. using reason or logic in thinking out a problem. 2. in accordance with the principles of logic or reason; reasonable. 3. of sound mind; sane: the patient seemed quite rational. 4. endowed with the capacity to reason; capable of logical thought: man is a rational being. 5.

7. www.collinsdictionary.com › english › rationalRATIONAL definition and meaning | Collins English Dictionary

   www.collinsdictionary.com › english › rational

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   A rational person is someone who is sensible and is able to make decisions based on intelligent thinking rather than on emotion. Did he come across as a sane rational person? Rachel looked calmer and more rational now.

8. www.oxfordlearnersdictionaries.com › definitionrational adjective - Definition, pictures, pronunciation and ...

   www.oxfordlearnersdictionaries.com › definition

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   Definition of rational adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.