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Synonyms
ra·tion·al (răsh́ə-nəl)

[Middle English racional, from Old French racionel, from Latin ratiōnālis, from ratiō, ratiōn-, reason; see reason.]

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.

derivatives

rátion·al·ly
adverb
rátion·al·ness
noun