Meaning of rational


Use the adjective rational to describe people or ideas that operate according to logic or reason. While your brother has an artistic temperament, you have a rational one.

Rational comes from the Latin word rationalis, meaning reasonable or logical. If you’re rational, you do things based on logic, as opposed to impulse or whimsy. The original meaning in English was of something endowed with the ability to reason. Before we knew how smart some animals like dolphins are, writers liked to distinguish rational human minds from the supposedly irrational, instinctual minds of animals.

Definitions of rational
  1. adjective

    consistent with or based on or using reason

    rational behavior”
    “a process of
    rational inference”
    rational thought”


    capable of or reflecting the capability for correct and valid reasoning
    coherent, logical, lucid

    capable of thinking and expressing yourself in a clear and consistent manner
    demythologised, demythologized

    having mythical elements removed
    intelligent, reasoning, thinking

    endowed with the capacity to reason
    reasonable, sane

    marked by sound judgment
    reasonable, sensible

    showing reason or sound judgment

    mentally healthy; free from mental disorder
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    not consistent with or using reason

    without logical or meaningful connection
    illogical, unlogical

    lacking in correct logical relation
    blind, unreasoning

    not based on reason or evidence

    not endowed with the capacity to reason

    not based on reason

    showing ignorance of the laws of nature and faith in magic or chance

    not reasonable; not showing good judgment
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  2. adjective

    of or associated with or requiring the use of the mind

    “the triumph of the
    rational over the animal side of man”

    intellectual, noetic


    involving the mind or an intellectual process
  3. adjective

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

    rational analysis”


    appealing to or using the intellect
  4. adjective

    capable of being expressed as a quotient of integers

    rational numbers”
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    real but not expressible as the quotient of two integers

  5. noun

    an integer or a fraction


    rational number

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    show 7 types…
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    the quotient of two rational numbers
    fixed-point part, mantissa

    the positive fractional part of the representation of a logarithm; in the expression log 643 = 2.808 the mantissa is .808
    common fraction, simple fraction

    the quotient of two integers
    improper fraction

    a fraction whose numerator is larger than the denominator
    proper fraction

    a fraction with a numerator smaller than the denominator
    complex fraction, compound fraction

    a fraction with fractions in the numerator or denominator
    continued fraction

    a fraction whose numerator is an integer and whose denominator is an integer plus a fraction whose numerator is an integer and whose denominator is an integer plus a fraction and so on
    type of:

    real, real number

    any rational or irrational number

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