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1. WordNet® 3.0 (2006)
    adj 1: consistent with or based on or using reason; "rational
           behavior"; "a process of rational inference"; "rational
           thought" [ant: 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" [syn: intellectual, rational,
    3: capable of being expressed as a quotient of integers;
       "rational numbers" [ant: irrational]
    4: having its source in or being guided by the intellect (as
       distinguished from experience or emotion); "a rational
    n 1: an integer or a fraction [syn: rational number,

2. The Collaborative International Dictionary of English v.0.48
Rational \Ra"tion*al\ (r[a^]sh"[u^]n*al), a. [L. rationalis: cf.
   F. rationnel. See Ratio, Reason, and cf. Rationale.]
   1. Relating to the reason; not physical; mental.
      [1913 Webster]

            Moral philosophy was his chiefest end; for the
            rational, the natural, and mathematics . . . were
            but simple pastimes in comparison of the other.
                                                  --Sir T.
      [1913 Webster]

   2. Having reason, or the faculty of reasoning; endowed with
      reason or understanding; reasoning.
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            It is our glory and happiness to have a rational
            nature.                               --Law.
      [1913 Webster]

   3. Agreeable to reason; not absurd, preposterous,
      extravagant, foolish, fanciful, or the like; wise;
      judicious; as, rational conduct; a rational man.
      [1913 Webster]

   4. (Chem.) Expressing the type, structure, relations, and
      reactions of a compound; graphic; -- said of formulae. See
      under Formula.
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   Rational horizon. (Astron.) See Horizon, 2
      (b) .

   Rational quantity (Alg.), one that can be expressed without
      the use of a radical sign, or in exact 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
      [1913 Webster]

   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
          irrational; 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 desires or plans; a
          reasonable charge; a reasonable prospect of success.
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                What higher in her society thou find'st
                Attractive, human, rational, love still.
          [1913 Webster]

                A law may be reasonable in itself, although a
                man does not allow it, or does not know the
                reason of the lawgivers.          --Swift.
          [1913 Webster]

3. The Collaborative International Dictionary of English v.0.48
Rational \Ra"tion*al\, n.
   A rational being. --Young.
   [1913 Webster]

4. The Free On-line Dictionary of Computing (30 December 2018)

   [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.

5. The Devil's Dictionary (1881-1906)
RATIONAL, adj.  Devoid of all delusions save those of observation,
experience and reflection.

Thesaurus Results for rational:

1. Moby Thesaurus II by Grady Ward, 1.0
acceptable, admissible, algorismic, algorithmic, aliquot, all there, analytic, balanced, bright, calm, cardinal, cerebral, circumspect, clear-eyed, clearheaded, clearminded, cogent, commonsense, compos mentis, conceptive, conceptual, consequent, cool, coolheaded, credible, decimal, differential, digital, discriminating, discursive, down-to-earth, earthy, endopsychic, enlightened, even, everyday, exponential, figural, figurate, figurative, finite, fractional, hardheaded, healthy-minded, ideational, imaginary, impair, impossible, infinite, informed, integral, intellectual, intelligent, internal, irrational, judicious, just, justifiable, knowing, knowledgeable, legitimate, level-headed, levelheaded, logarithmic, logical, logometric, lucid, matter-of-fact, mental, mentally sound, negative, noetic, noological, normal, not so dumb, numeral, numerary, numerative, numeric, odd, of sound mind, ordinal, pair, philosophical, phrenic, plausible, positive, positivistic, possible, practical, practical-minded, pragmatic, prime, prudent, psychic, psychologic, radical, ratiocinative, ratiocinatory, real, realist, realistic, reasonable, reasoning, reciprocal, right, sane, sane-minded, scientific, scientistic, secular, sensible, sober, sober-minded, sophic, sound, sound-minded, sound-thinking, spiritual, stable, straight-thinking, strong-minded, subjective, submultiple, surd, thinking, together, transcendental, understanding, unideal, unidealistic, unromantic, unsentimental, well-argued, well-balanced, well-founded, well-grounded, wholesome, wise, worldly
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