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Definition of rational


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ra·tion·al  audio  (rsh-nl) KEY 

ADJECTIVE:
  1. Having or exercising the ability to reason.
  2. Of sound mind; sane.
  3. Consistent with or based on reason; logical: rational behavior. See Synonyms at logical.
  4. Mathematics Capable of being expressed as a quotient of integers.
NOUN:
Mathematics
A rational number.

ETYMOLOGY:
Middle English racional, from Old French racionel, from Latin ratinlis, from rati, ratin-, reason ; see reason

OTHER FORMS:
ration·al·ly(Adverb), ration·al·ness(Noun)


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