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Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Quantify \Quan"ti*fy\, v. t. [L. quantus now much + -fy.]
      1. To modify or qualify with respect to quantity; to
         determine, fix or express the quantity of; to rate.
         [1913 Webster]
      2. (Logic) To make explicit the quantity of; as, to quantify
         a variable.
         [PJC]