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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

   

   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

   

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

   www.oxfordlearnersdictionaries.com · definition · english

   

   (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.

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

   www.thefreedictionary.com · rational

   

   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 · us · dictionaryRATIONAL definition in American English - Collins Online ...

   www.collinsdictionary.com · us · dictionary

   

   adjective. 1. agreeable to reason; reasonable; sensible. a rational plan for economic development. 2. having or exercising reason, sound judgment, or good sense. a calm and rational negotiator. 3. being in or characterized by full possession of one's reason; sane; lucid.

8. dictionary.cambridge.org · dictionary · learner-englishRATIONAL | meaning - Cambridge Learner's Dictionary - Cambridge ...

   dictionary.cambridge.org · dictionary · learner-english

   

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

9. www.yourdictionary.com · rationalRational Definition & Meaning - YourDictionary

   www.yourdictionary.com · rational

   

   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.

10. www.ldoceonline.com · dictionary · rationalrational | meaning of rational in Longman Dictionary of...

    www.ldoceonline.com · dictionary · rational

    

    rational meaning, definition, what is rational: rational thoughts, decisions etc are bas...: Learn more.

11. www.oed.com · dictionary · rational_n1rational, n.¹ meanings, etymology and more - Oxford English ...

    www.oed.com · dictionary · rational_n1

    

    What does the noun rational mean? There are ten meanings listed in OED's entry for the noun rational, six of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence. rational has developed meanings and uses in subjects including.