A sentence using the word catharsis is: "Singing loudly in the car on her way home from work is a form of catharsis for Linda after dealing with customer complaints all day." Catharsis means "relieving of emotional tensions."
Catharsis is also a form of psychotherapy that allows for the discharge of pent-up emotions. A sentence using the term in this way is: "The psychologist used catharsis on her patient to encourage her to cry after months of denying her sadness." Yet another definition is the "discharge of pent-up emotions" as in the sentence: "Crying is a catharsis for many people."