Dereism is a psychological term that refers to a state of mind where a person experiences a disconnection from reality. It is often associated with delusional thinking or psychosis. Some synonyms for dereism include dissociation, detachment, alienation, disengagement, and estrangement. These words all convey a sense of separation or disconnection, either from oneself or from the external world. Other related concepts include depersonalization, where a person feels detached from their own body or self, and derealization, where a person experiences a sense of unreality or distortion of the external world. Understanding these synonyms and concepts can help individuals recognize and seek treatment for such mental health issues.