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rationale (n.)
1650s, "exposition of principles," from Late Latin rationale, noun use of neuter of Latin rationalis "of reason" (see rational). Hence, "fundamental reason, the rational basis or motive of anything" (1680s).
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Definitions of rationale
Dictionary entries near rationale
ratio
ratiocinate
ratiocination
ration
rational
rationale
rationalise
rationalist
rationality
rationalization
rationalize