Definitions for Rationalˈræʃ ə nl, ˈræʃ nl

This page provides all possible meanings and translations of the word Rational

Random House Webster's College Dictionary

ra•tion•alˈræʃ ə nl, ˈræʃ nl(adj.)

  1. based on or agreeable to reason:

    a rational decision.

  2. exercising reason:

    a rational negotiator.

  3. sane; lucid:

    The patient seems rational.

  4. Math. 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.

    Category: Math

  5. Ref: rational number.

Origin of rational:

1350–1400; ME racional < L ratiōnālis=ratiōn- (s. of ratiō) reason+-ālis -al1


Princeton's WordNet

  1. rational number, rational(adj)

    an integer or a fraction

  2. rational(adj)

    consistent with or based on or using reason

    "rational behavior"; "a process of rational inference"; "rational thought"

  3. intellectual, rational, noetic(adj)

    of or associated with or requiring the use of the mind

    "intellectual problems"; "the triumph of the rational over the animal side of man"

  4. rational(adj)

    capable of being expressed as a quotient of integers

    "rational numbers"

  5. rational(adj)

    having its source in or being guided by the intellect (as distinguished from experience or emotion)

    "a rational analysis"

Kernerman English Learner's Dictionary

  1. rational(adjective)ˈræʃ ə nl, ˈræʃ nl

    ≠ irrational

    a rational decision; Her remarks were calm and rational.

  2. rationalˈræʃ ə nl, ˈræʃ nl

    ≠ irrational

    a rational voice in a time of chaos

Webster Dictionary

  1. Rational(adj)

    relating to the reason; not physical; mental

  2. Rational(adj)

    having reason, or the faculty of reasoning; endowed with reason or understanding; reasoning

  3. Rational(adj)

    agreeable to reason; not absurd, preposterous, extravagant, foolish, fanciful, or the like; wise; judicious; as, rational conduct; a rational man

  4. Rational(adj)

    expressing the type, structure, relations, and reactions of a compound; graphic; -- said of formulae. See under Formula

  5. Rational(noun)

    a rational being


  1. Rational

    Consistent, logical.

British National Corpus

  1. Spoken Corpus Frequency

    Rank popularity for the word 'Rational' in Spoken Corpus Frequency: #3966

  2. Adjectives Frequency

    Rank popularity for the word 'Rational' in Adjectives Frequency: #532

Anagrams of Rational

  1. Notarial

Translations for Rational

Kernerman English Multilingual Dictionary


able to think, reason and judge etc

Man is a rational animal.

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