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rationalMain Entry: 1ra·tio·nal Pronunciation: \ˈrash-nəl, ˈra-shə-nəl\ Function: adjective Etymology: Middle English racional, from Anglo-French racionel, from Latin rationalis, from ration-, ratio Date: 14th century 1 a : having reason or understanding b : relating to, based on, or agreeable to reason : reasonable <a rational explanation> <rational behavior> — ra·tio·nal·ly adverb — ra·tio·nal·ness noun
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