purgation

(noun) purging the body by the use of a cathartic to stimulate evacuation of the bowels. Synonyms: catharsis, katharsis.

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

(noun) the act of clearing yourself (or another) from some stigma or charge. Synonyms: purge, purging.