GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Duple (?), a. [L. duplus. See Double.] Double.
   
   [1913 Webster]
   
   Duple ratio (Math.), that in which the antecedent term is double the consequent, as of 2 to 1, 8 to 4, etc.
   
   [1913 Webster]