schizophrenia definitions
By Mayo Clinic Staff. Print. Schizophrenia is a severe mental disorder in which people interpret reality abnormally. Schizophrenia may result in some combination of hallucinations, delusions, and extremely disordered thinking and behavior that impairs daily functioning, and can be disabling. Schizophrenia is a chronic condition, requiring lifelong treatment. Oct. 11, 2016.