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View synonyms for

rational

[ rash-uh-nl, rash-nl ]

adjective

  1. agreeable to reason; reasonable; sensible:

    a rational plan for economic development.

  2. having or exercising reason, sound judgment, or good sense:

    a calm and rational negotiator.

    Synonyms: , , ,

    Antonyms:

  3. being in or characterized by full possession of one's reason; sane; lucid:

    The patient appeared perfectly rational.

    Antonyms:

  4. endowed with the faculty of reason:

    rational beings.

  5. of, relating to, or constituting reasoning powers:

    the rational faculty.

  6. proceeding or derived from reason or based on reasoning:

    a rational explanation.

  7. Mathematics.
    1. capable of being expressed exactly by a ratio of two integers.
    2. (of a function) capable of being expressed exactly by a ratio of two polynomials.
  8. Classical Prosody. capable of measurement in terms of the metrical unit or mora.


noun

  1. Mathematics. rational number.

rational

/ ˈæʃəə /

adjective

  1. using reason or logic in thinking out a problem
  2. in accordance with the principles of logic or reason; reasonable
  3. of sound mind; sane

    the patient seemed quite rational

  4. endowed with the capacity to reason; capable of logical thought

    man is a rational being

  5. maths expressible as a ratio of two integers or polynomials

    a rational number; a rational function

“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

noun

  1. maths a rational number
“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
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Derived Forms

  • ˈپDzԲ, adverb
  • ˈپDzԲԱ, noun
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Other Word Forms

  • ·پDz·· adverb
  • ·پDz··Ա noun
  • ·پ··پDz· adjective
  • ···پDz· adjective
  • ԴDz··پDz· adjective
  • ···پDz· adjective
  • ··پDz· adjective
  • ܲ·-·پDz· adjective
  • ٰԲ··پDz· adjective
  • ܱ·ٰ··پDz· adjective
  • ܲ··پDz· adjective
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Word History and Origins

Origin of rational1

First recorded in 1350–1400; Middle English racional, from Latin پō, equivalent to پō- (stem of پō ) reason + - -al 1
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Word History and Origins

Origin of rational1

C14: from Latin پōnālis , from پō reason
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Synonym Study

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Example Sentences

Examples have not been reviewed.

It requires only rationality— an acceptable policy goal combined with rational actions to achieve that goal.

From

Dauntless, rational visionaries are always in short supply, especially now.

From

However the judge told Prosper that any condition did not "impair your ability to understand the nature of your conduct, exercise self-control or form rational judgments when you decided to commit violent crimes".

From

“Psychological research has shown us that panic amplifies helplessness and sabotages rational thought,” Michael Valdez, an expert in neurology and addictive behaviors, told Salon.

From

Otherworldly movement somehow matched the different music in ways that seem rational but not needing to make sense.

From

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