Source : Webster's Revised Unabridged Dictionary (1913)

Quantitative \Quan"ti*ta*tive\, a. [Cf. F. quantitatif.]
   Relating to quantity. -- {Quan"ti*ta*tive*ly}, adv.

   {Quantitative analysis} (Chem.), analysis which determines
      the amount or quantity of each ingredient of a substance,
      by weight or by volume; -- contrasted with qualitative
      analysis.

Source : WordNet®

quantitatively
     adv : in a quantitative manner; "this can be expressed
           quantitatively"