Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for rational from the 1913 edition of Webster's Revised Unabridged Dictionary. Define rational using one of the most comprehensive free online dictionaries on the web.

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Part of Speech: Noun
Results: 5
3. Agreeable to reason; not absurd, preposterous, extravagant, foolish, fanciful, or the like; wise; judicious; as, rational conduct; a rational man.
4. Expressing the type, structure, relations, and reactions of a compound; graphic; - said of formulae. See under Formula.
Part of Speech: noun
1. A rational being.
Examples of usage:
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