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1. Dictionary

   rational

   /ˈraʃən(ə)l/

   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-facthard-headedwith both one's feet on the groundunidealisticinformal:joined-upOpposite irrationalillogical
   • ▪ able to think sensibly or logically: "Ursula'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 balancedclear-headedcompos 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 which are expressible, as a ratio of whole numbers.

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

   dictionary.cambridge.org › dictionary › english

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   adjective. uk / ˈræʃ. ə n. ə l / us / ˈræʃ. ə n. ə l / Add to word list. C1. based on clear thought and reason: There must be some rational explanation for what happened. a rational act / course of action. a rational argument / decision. He was too upset to be rational. Fewer examples. In that state of mind you can't make a rational decision.

3. 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.

4. www.dictionary.com › browse › rationalRATIONAL Definition & Meaning | Dictionary.com

   www.dictionary.com › browse › rational

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   being in or characterized by full possession of one's reason; sane; lucid: The patient appeared perfectly rational. Antonyms: insane. endowed with the faculty of reason: rational beings. of, relating to, or constituting reasoning powers: the rational faculty. proceeding or derived from reason or based on reasoning:

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

   www.collinsdictionary.com › dictionary › english

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   designating or of a real number or quantity expressible as the ratio of two integers, with the second integer not being equal to zero: all integers and fractions are rational numbers. see also irrational (sense 3) b. designating a function expressible as the quotient of two polynomials.

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

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

   www.oxfordlearnersdictionaries.com › definition › english

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   (of a person) able to think clearly and make decisions based on reason rather than emotions synonym reasonable. No rational person would ever behave like that. Try to be rational about it. Humans are essentially rational beings. She said that she had not been fully rational when she signed the form. Topics Personal qualities c1.