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English Dictionary: rational by the DICT Development Group
4 results for rational
From WordNet (r) 3.0 (2006) [wn]:
  1. consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought"
    Antonym(s): irrational
  2. of or associated with or requiring the use of the mind; "intellectual problems"; "the triumph of the rational over the animal side of man"
    Synonym(s): intellectual, rational, noetic
  3. capable of being expressed as a quotient of integers; "rational numbers"
    Antonym(s): irrational
  4. having its source in or being guided by the intellect (as distinguished from experience or emotion); "a rational analysis"
  1. an integer or a fraction [syn: rational number, rational]
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Rational \Ra"tion*al\, n.
      A rational being. --Young.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Rational \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[91].
            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

From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
      [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}.
No guarantee of accuracy or completeness!
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