purification

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

(noun) the process of removing impurities (as from oil or metals or sugar etc.). Synonyms: refining, refinement.

(noun) a ceremonial cleansing from defilement or uncleanness by the performance of appropriate rites. Synonyms: purgation.

(noun) the act of purging of sin or guilt; moral or spiritual cleansing. Example: "Purification through repentance."