cleansing; emptying of impurities; purification
I felt a great sense of catharsis when I wrote my autobiography, and finally released all those troubling memories that I had been holding inside for so many years.
katharos (pure, clear of dirt, clean, spotless) (Greek)
CATHA sounds like KATHA (a religious story in hindi). KATHA leads to the purging (means release) of emotional tensions.