What is the Partial or complete disappearance of symptoms?

The term you're looking for is "remission". Remission refers to the partial or complete disappearance of symptoms of a disease or condition. It can be a temporary or permanent state, depending on the underlying cause. Remission is often used in the context of cancer, where it refers to the reduction or disappearance of tumors and other symptoms of the disease. In some cases, remission can be achieved through treatment, such as chemotherapy or radiation therapy, while in other cases it may occur spontaneously or without any specific treatment.