noun

• (pathology) A psychiatric diagnosis denoting a persistent, often chronic, mental illness characterised by abnormal perception, thinking, behavior and emotion, often marked by delusions.
  "Increasing data suggests that regular marijuana use in adolescence may also be a risk factor for developing very serious psychotic disorders, especially schizophrenia."
• (now deprecated) A condition in which a person is supposed to have several distinct personalities; dissociative identity disorder.
  "You have enough money to afford schizophrenia for a while. Especially if the personality B dreams up things that personality A makes practical, financially advantageous use of."
• (informal, figurative) Any condition in which disparate or mutually exclusive activities coexist; a lack of decision between options.
  "[O]ne can understand how the cultural disorientation which beset the African Continent has confused Africa's political behaviour, creating a political schizophrenia that made nation-building impossible."