Rational

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