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rational

Pronunciation: /ˈraʃ(ə)n(ə)l/

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Definition of rational

adjective

  • 1based on or in accordance with reason or logic:I’m sure there’s a perfectly rational explanation
  • able to think sensibly or logically:Ursula’s upset—she’s not being very rational
  • endowed with the capacity to reason:man is a rational being
  • 2 Mathematics (of a number, quantity, or expression) expressible, or containing quantities which are expressible, as a ratio of whole numbers.

Derivatives

rationality

Pronunciation: /-ˈnalɪti/

noun

rationally

adverb

Origin:

late Middle English (in the sense 'having the ability to reason'): from Latin rationalis, from ratio(n-) 'reckoning, reason' (see ratio)

rational in other Oxford dictionaries

Definition of rational in the US English dictionary

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