One of the mysteries of the English language finally explained.
1Originally Scottish. Of a thing: in accordance with or conformable to reason; reasonable, just, fair.
2Of a sentient being: having the faculty of reasoning; capable of reasoning; open to reason; rational, sensible.
Able to be rationed; capable of being rationed.
Late 15th century; earliest use found in de Mondeville's Surgery. From classical Latin ratiōnābilis rational, reasonable from ratiōn-, ratiō + -ābilis. Compare Old French rationable endowed with reason<br>1940s. From ration + -able.
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