Source : Webster's Revised Unabridged Dictionary (1913)

Adulteration \A*dul`ter*a"tion\, n. [L. adulteratio.]
   1. The act of adulterating; corruption, or debasement (esp.
      of food or drink) by foreign mixture.

            The shameless adulteration of the coin. --Prescott.

   2. An adulterated state or product.

Source : WordNet®

adulteration
     n 1: being mixed with extraneous material; the product of
          adultering [syn: {debasement}]
     2: the act of adulterating (especially the illicit substitution
        of one substance for another)