Definition - Delirium

de·lir·i·um n. pl. de·lir·i·ums or de·lir·i·a (--) A temporary state of mental confusion and fluctuating consciousness resulting from high fever, intoxication, shock, or other causes. It is characterized by anxiety, disorientation, hallucinations, delusions, and incoherent speech. A state of uncontrolled excitement or emotion: sports fans in delirium after their team's victory.