Schizophrenia

n. (Psychology) severe psychotic disorder characterized by psychosis (also characterized by agitation, catatonia, confusion, hallucinations, unusual behavior and extensive withdrawal); insulting term for a condition characterized by conflicting behavior or attitudes; term used in an informal manner to indicate a split personality (Slang)

Schizophrenia, from the Greek roots schizein (σχίζειν, "to split") and phrēn, phren- (φρήν, φρεν-, "mind"), is a psychiatric diagnosis that describes a mental illness characterized by impairments in the perception or expression of reality, most commonly manifesting as auditory hallucinations, paranoid or bizarre delusions or disorganized speech and thinking in the context of significant social or occupational dysfunction. Onset of symptoms typically occurs in young adulthood, with approximately 0.4–0.6% of the population affected. Diagnosis is based on the patient's self-reported experiences and observed behavior. No laboratory test for schizophrenia exists.
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Schizophrenia is a psychotic disorder marked by severely impaired thinking, emotions, and behaviors. [more]Schizophrenia - Community and Resources

Noun
1. any of several psychotic disorders characterized by distortions of reality and disturbances of thought and language and withdrawal from social contact
(synonym) schizophrenic disorder, schizophrenic psychosis, dementia praecox
(hypernym) psychosis
(hyponym) borderline schizophrenia, latent schizophrenia

The most common form of psychosis, characterized by partial or total withdrawal of interest in the world outside of oneself and loss of intellectual and emotional function.