Definition of rational in English:

rational

Line breaks: ra|tion¦al
Pronunciation: /ˈraʃ(ə)n(ə)l
 
/

adjective

1Based on or in accordance with reason or logic: I’m sure there’s a perfectly rational explanation
More example sentences
  • Hegel develops his rational ontology of gender within a logic of oppositions.
  • But for many people, their faith isn't based around an irrational fervour, and it isn't based around rational logic.
  • The ideals of liberty, equality, and fraternity proved inadequate as bases for a fully rational society.
Synonyms
logical, reasoned, well reasoned, sensible, reasonable, cogent, coherent, intelligent, wise, judicious, sagacious, astute, shrewd, perceptive, enlightened, clear-eyed, clear-sighted, commonsensical, common-sense, well advised, well grounded, sound, sober, prudent, circumspect, politic; down-to-earth, practical, pragmatic, matter-of-fact, hard-headed, with both one's feet on the ground, unidealistic
informal joined-up
1.1Able to think sensibly or logically: Ursula’s upset—she’s not being very rational
More example sentences
  • Unlike the first two, Proviesque rarely displays a logical structure that can be followed by sensible rational people.
  • To be honest, I once thought about having another woman, but I did not do it because I was able to be rational, I did not want to take any risks.
  • I have a friend, a sensible, rational creature, not outwardly generous, but happy to share a garibaldi if pressed.
Synonyms
lucid, coherent, sane, in one's right mind, able to think/reason clearly, of sound mind, in possession of all one's faculties; normal, balanced, well balanced, clear-headed; Latincompos mentis
informal all there
1.2Endowed with the capacity to reason: man is a rational being
More example sentences
  • Kant said that the mind is rational, it is endowed with Reason.
  • Since men are rational and egoistic, endowed with the right of property, the composition of output should be determined by consumer sovereignty.
  • There is implanted in every rational being the capacity to distinguish the true from the false, to weigh the evidence, and to confront the world without illusions.
Synonyms
2 Mathematics (Of a number, quantity, or expression) expressible, or containing quantities which are expressible, as a ratio of whole numbers.
More example sentences
  • The set of rational numbers is denumerable, that is, it has cardinal number d.
  • His idea was that every real number r divides the rational numbers into two subsets, namely those greater than r and those less than r.
  • Term formalism can perhaps be extended to the integers and rational numbers, but what are the real numbers supposed to be?

Origin

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

Derivatives

rationality

Pronunciation: /-ˈnalɪti/
noun
More example sentences
  • Truth, science, intellectual inquiry and rationality are inextricably bound together.
  • His threat lay in his cold rationality and his overwhelming intellectual authority.
  • Our judgements are constrained by rationality to the extent that we cannot just label any movement a cult by pure whim.

rationally

adverb
More example sentences
  • From this perspective you will be able to think much more clearly and rationally.
  • Her philosophy was that everything could be explained logically and rationally.
  • Anger clearly breeds stupidity, but let us try to think rationally this Sunday.

Definition of rational in:

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