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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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   Learn the meaning of rational as an adjective and a noun, with synonyms, examples, and word history. Find out how rational relates to reason, logic, mathematics, and medicine.

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

   dictionary.cambridge.org › dictionary › english

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   Rational means based on clear thought and reason. Learn how to use this adjective in different contexts, such as rational explanation, rational decision, rational argument, and more.

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5. www.collinsdictionary.com › dictionary › englishRATIONAL definition and meaning | Collins English Dictionary

   www.collinsdictionary.com › dictionary › english

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   Learn the meaning of rational as an adjective and a noun in mathematics and psychology, and see how to use it in sentences. Find synonyms, pronunciation, and word frequency of rational.

6. 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.

7. dictionary.cambridge.org › dictionary › learner-englishRATIONAL | meaning - Cambridge Learner's Dictionary

   dictionary.cambridge.org › dictionary › learner-english

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   Rational means based on facts and not affected by emotions or imagination, or able to make decisions without being influenced by emotions or imagination. See how to use rational in sentences and compare it with irrational.

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

   www.thefreedictionary.com › rational

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   Rational means having or using reason, logical, or sensible. It can also refer to a type of number or function in mathematics. See synonyms, antonyms, and usage examples of rational.

9. www.yourdictionary.com › rationalRational Definition & Meaning | YourDictionary

   www.yourdictionary.com › rational

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   Learn the different meanings and uses of the word rational as an adjective and a noun. Find synonyms, antonyms, examples, and related words for rational.