rational

1. a. Relating to the reason; not physical; mental. Source: opted

2. a. Having reason, or the faculty of reasoning; endowed with reason or understanding; reasoning. Source: opted

3. a. Agreeable to reason; not absurd, preposterous, extravagant, foolish, fanciful, or the like; wise; judicious; as, rational conduct; a rational man. Source: opted

4. a. Expressing the type, structure, relations, and reactions of a compound; graphic; -- said of formulae. See under Formula. Source: opted

5. n. A rational being. Source: opted

6. adj. consistent with or based on or using reason Source: wordnet

7. adj. of or associated with or requiring the use of the mind Source: wordnet

8. adj. capable of being expressed as a quotient of integers Source: wordnet

9. adj. having its source in or being guided by the intellect (as distinguished from experience or emotion) Source: wordnet

10. n. an integer or a fraction Source: wordnet

11. 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. 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 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 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 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 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. A rational being. Young. Source: webster

12. Expressing the type, structure, relations, and reactions of acompound; graphic; -- said of formulæ. See under Formula. Rationalhorizon. (Astron.) See Horizon, 2 (b).-- Rational quantity (Alg. ), one that can be expressed without theuse of a radical sign, or in extract parts of unity; -- opposed toirrational or radical quantity.-- Rational symptom (Med.), one elicited by the statements of thepatient himself and not as the result of a physical examination. Source: adambom

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