Definition of rational in English:

rational

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

adjective

  • 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?

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.

Origin

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

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