Webster's English Dictionary

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ratio

ra.tio \'ra--(.)sho-, -she--.o-\ n [L, computation, reason - more at 
   REASON] 1a: the indicated quotient of two mathematical expressions  1b: the 
   relationship in quantity, amount, or size between two or more thing s : 
   PROPORTION 2: the expression of the relative values of gold and silver as 
   determined b y a country's currency laws