Share this entry

Share this page


Syllabification: de·lu·sion
Pronunciation: /dəˈlo͞oZHən

Definition of delusion in English:


1An idiosyncratic belief or impression that is firmly maintained despite being contradicted by what is generally accepted as reality or rational argument, typically a symptom of mental disorder: the delusion of being watched
More example sentences
  • The rise of psychoanalysis did much to validate the contents of mental symptoms, including delusions.
  • In the paranoid form of this disorder, they develop delusions of persecution or personal grandeur.
  • LSD can induce a psychotic state with paranoid delusions that can last for months.
1.1The action of deluding someone or the state of being deluded: what a capacity television has for delusion
More example sentences
  • The rest of us play along, but no one is fooled by this necessary delusion.
  • In short, the evidence points more towards hoaxing and delusion than real discovery.
  • What is deceit or delusion, and what is genuine in this movement?


late Middle English (in the sense 'act of deluding or of being deluded'): from late Latin delusio(n-), from the verb deludere (see delude).


delusions of grandeur

A false impression of one’s own importance.
Example sentences
  • The purpose of that story was to demonstrate that a well-known and well-respected public figure was actually nothing more than a mindless hack with delusions of grandeur.
  • It is a pleasingly post-modern twist which Cervantes himself would have enjoyed, having written a book about absurd follies, delusions of grandeur and the deficit between fiction and reality.
  • The patient entertains delusions of grandeur.



Example sentences
  • Nor are such experiences delusional or hallucinatory in a psychiatric sense.
  • I know this may seem a lot to read into a casual glance, but I'm either very good at doing this, or else I'm slightly delusional.
  • If they don't think their health care plan isn't going to be an issue, they're delusional.

Definition of delusion in:

Share this entry

Share this page


What do you find interesting about this word or phrase?