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  1. Dictionary
    Ra·tion·al·i·ty
    /ˌraSHəˈnalədē/

    noun

    • 1. the quality of being based on or in accordance with reason or logic: "like any phobia, rationality plays only a small role"
    • 2. the property of a number, quantity, or expression of being expressible, or containing quantities which are expressible, as a ratio of whole numbers.