Rationale
来自Big Physics
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mid 17th century: modern Latin, neuter (used as a noun) of Latin rationalis ‘endowed with reason’ (see rational).
wiktionary
(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.) From Latin ratiōnāle.
(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.) From Latin ratiōnāle.
etymonline
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).