Remmession appears to be a typographical error or a less commonly known term, as it does not have a widely recognized definition in medical, psychological, or general contexts. If you meant "remission," it refers to a decrease or disappearance of the signs and symptoms of a disease, particularly in chronic illnesses like cancer. In this state, a patient may experience an improvement in their condition, although it does not always indicate a complete cure. If you meant something else, please provide more context for clarification.