purification

definition: the act of purging of sin or guilt
example:
speech part: noun
synonyms:
definition: a ceremonial cleansing from defilement or uncleanness by the performance of appropriate rites
example:
speech part: noun
synonyms: purgation
definition: the act of cleaning by getting rid of impurities
example:
speech part: noun
synonyms:
definition: the process of removing impurities (as from oil or metals or sugar etc.)
example:
speech part: noun
synonyms: refinement refining

How purification is being used?