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Noun: folie de grandeur
  1. A delusion (common in paranoia) that you are much greater and more powerful and influential than you really are
    "The patient's folie de grandeur led him to believe he was a world-famous celebrity";
    - delusions of grandeur

Derived forms: folies de grandeur

Type of: delusion, psychotic belief

Part of: megalomania

Encyclopedia: Folie de grandeur