Source : Webster's Revised Unabridged Dictionary (1913)

Dosage \Dos"age\ (d[=o]s"[asl]j), n. [Cf. F. dosage. See {Dose},
   v.]
   1. (Med.) The administration of medicine in doses; specif., a
      scheme or system of grading doses of medicine according to
      age, etc.

   2. The process of adding some ingredient, as to wine, to give
      flavor, character, or strength.

Source : WordNet®

dosage
     n : the quantity of an active agent (substance or radiation)
         taken in or absorbed at any one time [syn: {dose}]