noun (n)

• the act of cleaning by getting rid of impurities(noun.act)

  source: wordnet30
• the process of removing impurities (as from oil or metals or sugar etc.)(noun.process)

  Synonym:
  refinement, refining
  

  source: wordnet30
• a ceremonial cleansing from defilement or uncleanness by the performance of appropriate rites(noun.act)

  Synonym:
  purgation
  

  source: wordnet30
• the act of purging of sin or guilt; moral or spiritual cleansing(noun.act)

  Example:
  Purification through repentance.
  

  source: wordnet30
• The act of purifying; the act or operation of separating and removing from anything that which is impure or noxious, or heterogeneous or foreign to it; as, the purification of liquors, or of metals.(noun)

  source: webster1913