Rational

a.	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 b - (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. 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.
n.	1.	A rational being.

Adj.	1.	rational - consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought" Antonyms: irrational - not consistent with or using reason; "irrational fears"; "irrational animals"
	2.	rational - of or associated with or requiring the use of the mind; "intellectual problems"; "the triumph of the rational over the animal side of man" Synonyms: noetic, intellectual
	3.	rational - capable of being expressed as a quotient of integers; "rational numbers" Antonyms: irrational - real but not expressible as the quotient of two integers; "irrational numbers"
	4.	rational - having its source in or being guided by the intellect (distinguished from experience or emotion); "a rational analysis"

rational - [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.

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