Schizophrenia is a mental disorder where you perceive things incorrectly, often imagining things that are not real.(noun)
An example of schizophrenia is a mental disorder where a person begins to hear voices in his head and believe they are real.
See schizophrenia in Webster's New World College Dictionary
Origin: ModL < schizo- + Gr phrēn, the mind + -ia
See schizophrenia in American Heritage Dictionary 4
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