"arranged logically," 1777, from French raisonné "reasoned," past participle of raisonner "to reason," from raison "course; matter; subject; language, speech; thought, opinion," from Latin rationem (nominative ratio) "reckoning, understanding, motive, cause," from ratus, past participle of reri "to reckon, think," from PIE root *re- "to reason, count."
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