Delusion
Definition 1 of 2
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Mental Illness Link
Delusions often indicate mental illness, especially conditions like schizophrenia or bipolar disorder. His therapist said that his delusion is a symptom of his schizophrenia.
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Grandeur or Persecution
Delusions can involve feelings of great importance or unjust maltreatment. She believes she's a descendant of royalty, a typical delusion of grandeur.
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Contextual nuance
In literature, 'delusion' is used to explore characters' flawed perceptions or reality. The protagonist's delusion fueled his misguided actions throughout the novel.