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   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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