Source : Webster's Revised Unabridged Dictionary (1913)

Impurity \Im*pu"ri*ty\, n.; pl. Impurities . [L. impuritas: cf.
   F. impuret['e].]
   1. The condition or quality of being impure in any sense;
      defilement; foulness; adulteration.

            Profaneness, impurity, or scandal, is not wit.
                                                  --Buckminster.

   2. That which is, or which renders anything, impure; foul
      matter, action, language, etc.; a foreign ingredient.

            Foul impurities reigned among the monkish clergy.
                                                  --Atterbury.

   3. (Script.) Want of ceremonial purity; defilement.

Source : WordNet®

impurity
     n 1: worthless material that should be removed; "there were
          impurities in the water" [syn: {dross}]
     2: the condition of being impure [syn: {impureness}] [ant: {purity}]