noun (n)

• being mixed with extraneous material; the product of adulterating(noun.state)

  Synonym:
  debasement
  

  source: wordnet30
• the act of adulterating (especially the illicit substitution of one substance for another)(noun.act)

  source: wordnet30
• The act of adulterating; corruption, or debasement (esp. of food or drink) by foreign mixture.(noun)

  source: webster1913