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definitions

rational

[ rash-uh-nl, rash-nl ]
/ ˈræʃ ə nl, ˈræʃ nl /
||

adjective

noun

Mathematics. rational number.

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Nearby words

ratio test, ratiocinate, ratiocination, ratiometer, ration, rational, rational form, rational function, rational horizon, rational number, rational operation

Origin of rational

1350–1400; Middle English racional < Latin ratiōnālis, equivalent to ratiōn- (stem of ratiō) reason + -ālis -al1
SYNONYMS FOR rational
2 intelligent, wise, judicious, sagacious, enlightened.
6 See reasonable.
ANTONYMS FOR rational
2 stupid.
3 insane.
Related forms
Can be confusedrational reasonable (see synonym study at reasonable)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for hyper-rational

  • Slowly, slowly, unnaturally—as though energized by some hyper-rational power—his lips and tongue moved.

    There is a Reaper ...|Charles V. De Vet

British Dictionary definitions for hyper-rational

rational

/ (ˈræʃənəl) /

adjective

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

noun

maths a rational number
Derived Formsrationally, 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

Word Origin and History for hyper-rational

rational

adj.

late 14c., "pertaining to reason;" mid-15c., "endowed with reason," from Old French racionel and directly from Latin rationalis "of or belonging to reason, reasonable," from ratio (genitive rationis) "reckoning, calculation, reason" (see ratio).

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for hyper-rational

rational

[ răsh′ə-nəl ]

adj.

Having or exercising the ability to reason.
Influenced by reasoning rather than by emotion.
Of sound mind; sane.
Based on scientific knowledge or theory rather than practical observation.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.