Hyper Dictionary

English Dictionary Computer Dictionary Video Dictionary Thesaurus Dream Dictionary Medical Dictionary

Search Dictionary:  

Meaning of RATIONAL

Pronunciation:  'rashunl

WordNet Dictionary
  1. [adj]  having its source in or being guided by the intellect (distinguished from experience or emotion); "a rational analysis"
  2. [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"
  3. [adj]  consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought"
  4. [adj]  (math) capable of being expressed as a quotient of integers; "rational numbers"

RATIONAL is a 8 letter word that starts with R.


 Synonyms: coherent, demythologised, demythologized, intellectual, intelligent, logical, lucid, mental, noetic, reasonable, reasoning(a), sane, thinking(a)
 Antonyms: irrational, irrational
 See Also: sensible



Webster's 1913 Dictionary
  1. \Ra"tion*al\, a. [L. rationalis: cf. F. rationnel. See
    {Ratio}, {Reason}, and cf. {Rationale}.]
    1. Relating to reason; not physical; mental.
             Moral philosophy was his chiefest end; for the
             rational, the natural, and mathematics . . . were
             but simple pastimes in comparison of the other.
                                                   --Sir T.
    2. Having reason, or the faculty of reasoning; endowed with
       reason or understanding; reasoning.
             It is our glory and happiness to have a rational
             nature.                               --Law.
    3. Agreeable to reason; not absurd, preposterous,
       extravagant, foolish, fanciful, or the like; wise;
       judicious; as, rational conduct; a rational man.
    4. (Chem.) Expressing the type, structure, relations, and
       reactions of a compound; graphic; -- said of formul[ae].
       See under {Formula}.
    {Rational horizon}. (Astron.) See {Horizon}, 2
       (b) .
    {Rational quantity} (Alg.), one that can be expressed without
       the use of a radical sign, or in extract parts of unity;
       -- opposed to irrational or radical quantity.
    {Rational symptom} (Med.), one elicited by the statements of
       the patient himself and not as the result of a physical
    Syn: Sane; sound; intelligent; reasonable; sensible; wise;
         discreet; judicious.
    Usage: {Rational}, {reasonable}. Rational has reference to
           reason as a faculty of the mind, and is opposed to
           traditional; as, a rational being, a rational state of
           mind, rational views, etc. In these cases the
           speculative reason is more particularly, referred to.
           Reasonable has reference to the exercise of this
           faculty for practical purposes, and means, governed or
           directed by reason; as, reasonable prospect of
                 What higher in her society thou find'st
                 Attractive, human, rational, love still.
                 A law may be reasonable in itself, although a
                 man does not allow it, or does not know the
                 reason of the lawgivers.          --Swift.
  2. \Ra"tion*al\, n.
    A rational being. --Young.
Computing Dictionary

[Mathematics] a fractional number n/d, where n and d are integers, n is the numerator and d is the denominator. The set of all rational numbers is usually called Q. Computers do not usually deal with rational numbers but instead convert them to real numbers which are represented (approximately in some cases) as floating-point numbers. Compare irrational.