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Rational : ய.ஆறறிவுடைய பகுத்தறிவு வாய்ந்த அறவாராய்ச்சிமுறை சார்ந்த மட்டான நேர்மை வாய்ந்த நேரறிவு வாய்ந்த அறிவுக்குப் பொருத்தமான காரணகாரியத் தொடர்புடைய பொருத்தக்கேடற்ற வஜ்ம்புமீறாத மிகைபடாத மடமை சாராத பகுத்தறிவினடிப்படையிலமைந்த சமயத்துறையில் ஆராய்ச்சிக்குப் பொருந்தாதன நீக்கிய பழக்கவழக்கங்களில் பகுத்தறிவுக்கொவ்வாதன விலக்கிய பெண்டிர் ஆடை வகையில் அங்கிபாவாடையின்றிக் குழலாடையுடைய (கண) மற்ற இயலெண்களுடன் கூறாக்க நிலைத்தொடர்வுடை

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[3] Historical Dictionary: When a word was first coined, what was its spelling and meaning during the first coinage, when did its spelling, pronunciation and meaning change, and what is the current form and meaning of the word as described in the dictionary, so E. Historical Dictionary. E.g., The Shorter Oxford English Dictionary. The dictionary from which the word rational is derived has many meanings in the historical dictionary. But The Shorter Oxford English Dictionary is the best.

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