The term "casta diva" has its origins in the opera Norma, written by Italian composer Vincenzo Bellini. It is a phrase used to describe the character of Norma, who is a high priestess. The literal meaning of "casta diva" is "chaste goddess," but it has come to represent more than just that. Some synonyms for the term could be "virgin goddess," "pure goddess," or "celestial being." These words all capture the essence of the character of Norma and her role as a religious leader. The term "divine" could also be used as a synonym, as it conveys a sense of sacredness and otherworldliness.