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Noun: delusion  di'loo-zhun
  1. (psychology) an erroneous belief that is held in the face of evidence to the contrary
    "His delusion that he was being constantly watched by the government persisted despite lack of evidence";
    - psychotic belief
     
  2. A mistaken or unfounded opinion or idea
    "he has delusions of competence";
    - hallucination
     
  3. The act of deluding; deception by creating illusory ideas
    "She has a delusion that she is being spied on";
    - illusion, head game [informal]

Derived forms: delusions

Type of: deceit, deception, dissembling, dissimulation, mental condition, mental state, misconception, psychological condition, psychological state

Encyclopedia: Delusion