Source : Webster's Revised Unabridged Dictionary (1913)

Colorimetry \Col`or*im"e*try\, n. [See {Colorimeter}.]
   1. The quantitative determination of the depth of color of a
      substance.

   2. A method of quantitative chemical analysis based upon the
      comparison of the depth of color of a solution with that
      of a standard liquid.

Source : WordNet®

colorimetry
     n : quantitative chemical analysis by color using a colorimeter
         [syn: {colorimetric analysis}]