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(rsh"nal), 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 formul. 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.) Ra"tional n.A rational being. Young. スポンサード リンク
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