(1) an illness manifested by an enduring major depressive, manic, or mixed episode along with delusions, hallucinations, disorganized speech and behavior, and negative symptoms of schizophrenia. In the absence of a major depressive, manic, or mixed episode, there must be delusions or hallucinations for several weeks. (2) a DSM diagnosis that is established when the specified criteria are met.negative symptom, schizophrenia, major depressive disorder (2), mixed episode, manic episode, affective psychosis, major depression. Cf.: mood-congruent psychosis, mood-incongruent psychosis