Main Entry: de·lu·sion

Pronunciation: \di-ˈlü-zhən\

Function: noun

1 a : the act of deluding : the state of being deluded b : an abnormal mental state characterized by the occurrence of psychotic delusions
2 : a false belief regarding the self or persons or objects outside the self that persists despite the facts and occurs in some psychotic states—compare hallucination 1, illusion 2a