purification in WordNet English dictionary

1. a ceremonial cleansing from defilement or uncleanness by the performance of appropriate rites
   purification  purgation 
   
2. the act of cleaning by getting rid of impurities
   purification 
   
3. the act of purging of sin or guilt; moral or spiritual cleansing
   "purification through repentance"
   purification 
   
4. the process of removing impurities (as from oil or metals or sugar etc.)
   refining  refinement  purification