Definition of Rationel
Ra"tion*al (răsh"ŭn*al),
a. [L. rationalis: cf. F. rationnel.
See Ratio, Reason, and cf. Rationale.]
1. Relating to the 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.
North.
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
formulæ. 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 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 examination.
Syn. -- Sane; sound; intelligent; reasonable; sensible;
wise; discreet; judicious. -- 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.
What higher in her society thou find'st
Attractive, human, rational, love still.
Milton.
A law may be reasonable in itself, although a
man does not allow it, or does not know the reason of the
lawgivers. Swift.
Ra"tion*al, n. A rational
being. Young.
- Webster's Unabridged Dictionary (1913)
RATIONAL, adj. Devoid of all delusions save those of observation,
experience and reflection.
- 1811 Dictionary of the Vulgar Tongue
- Characterized by truth or logic.
- (arithmetic) (no (compar) or (superl)) Of a number, capable of being expressed as the ratio of two integers.
- The Nuttall Encyclopedia
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