Rational Definition
răshə-nəl
adjective
Of, based on, or derived from reasoning.
Rational powers.
Webster's New World
Able to reason; reasoning; in possession of one's reason or sanity.
Webster's New World
Showing reason; not foolish or silly; sensible.
A rational argument.
Webster's New World
Of sound mind; sane.
Wondered if the eccentric neighbor was not completely rational.
American Heritage
Designating or of a real number or quantity expressible as the ratio of two integers, with the second integer not being equal to zero: all integers and fractions are rational numbers.
Webster's New World
Synonyms:
Other Word Forms of Rational
Noun
Singular:
rationalPlural:
rationalsOrigin of Rational
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From Old French rational, from Medieval Latin rationale (“a pontifical stole, a pallium, an ornament worn over the chasuble"), neuter of Latin rationalis (“rational"), for which see the first etymology.
From Wiktionary
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Middle English racional from Old French racionel from Latin ratiōnālis from ratiō ratiōn- reason reason
From American Heritage Dictionary of the English Language, 5th Edition
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From Old French rationel, rational, from Latin rationalis (“of or belonging to reason, rational, reasonable"), from ratio (“reason")
From Wiktionary
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