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Rational (a.) Relating to the reason; not physical; mental.
Rational (a.) Having reason, or the faculty of reasoning; endowed with reason or understanding; reasoning.
Rational (a.) Agreeable to reason; not absurd, preposterous, extravagant, foolish, fanciful, or the like; wise; judicious; as, rational conduct; a rational man.
Rational (a.) Expressing the type, structure, relations, and reactions of a compound; graphic; -- said of formulae. See under Formula.
Rational (n.) A rational being.