[ rash-uh-nl, rash-nl ]
/ ˈræʃ ə nl, ˈræʃ nl /
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agreeable to reason; reasonable; sensible: a rational plan for economic development.
having or exercising reason, sound judgment, or good sense: a calm and rational negotiator.
being in or characterized by full possession of one's reason; sane; lucid: The patient appeared perfectly rational.
endowed with the faculty of reason: rational beings.
of, relating to, or constituting reasoning powers: the rational faculty.
proceeding or derived from reason or based on reasoning: a rational explanation.
- capable of being expressed exactly by a ratio of two integers.
- (of a function) capable of being expressed exactly by a ratio of two polynomials.
Classical Prosody. capable of measurement in terms of the metrical unit or mora.
Mathematics. rational number.
OTHER WORDS FOR rational
2 intelligent, wise, judicious, sagacious, enlightened.
OPPOSITES FOR rational
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Origin of rational
synonym study for rational
6. See reasonable.
OTHER WORDS FROM rational
ra·tion·al·ly, adverbra·tion·al·ness, nounan·ti·ra·tion·al, adjectivehy·per·ra·tion·al, adjective
non·ra·tion·al, adjectiveo·ver·ra·tion·al, adjectivepre·ra·tion·al, adjectivequa·si-ra·tion·al, adjectivetrans·ra·tion·al, adjectiveul·tra·ra·tion·al, adjectiveun·ra·tion·al, adjective
WORDS THAT MAY BE CONFUSED WITH rationalrational , reasonable (see synonym study at reasonable)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use rational in a sentence
The word empirical in its ordinary use does not mean "connected with experiment," but rather crude and unrational.Democracy and Education|John Dewey
Mysticism is here conceived as unethical, unhistorical, and unrational.Theology and the Social Consciousness|Henry Churchill King
British Dictionary definitions for rational
/ (ˈræʃənəl) /
using reason or logic in thinking out a problem
in accordance with the principles of logic or reason; reasonable
of sound mind; sanethe patient seemed quite rational
endowed with the capacity to reason; capable of logical thoughtman is a rational being
maths expressible as a ratio of two integers or polynomialsa rational number; a rational function
maths a rational number
Derived forms of rationalrationally, adverbrationalness, noun
Word Origin for rational
C14: from Latin ratiōnālis, from ratiō reason
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012