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rational (adj.)
late 14c., "pertaining to reason;" mid-15c., "endowed with reason," from Old French racionel and directly from Latin rationalis "of or belonging to reason, reasonable," from ratio (genitive rationis) "reckoning, calculation, reason" (see ratio).
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Definitions of rational from WordNet
Dictionary entries near rational
rating
ratio
ratiocinate
ratiocination
ration
rational
rationale
rationalise
rationalist
rationality
rationalization