Definition of delusion
1 : the act of tricking or deceiving someone : the state of being deluded … accused the Bohemian of having practised the most abominable arts of delusion among the younger brethren. — Walter Scott
2a : something that is falsely or delusively believed or propagated under the delusion that they will finish on schedule delusions of grandeurb psychology : a persistent false psychotic belief regarding the self or persons or objects outside the self that is maintained despite indisputable evidence to the contrary the delusion that someone was out to hurt him; also : the abnormal state marked by such beliefs
delusionalplay \-ˈlüzh-nəl, -ˈlü-zhə-nəl\ adjective
delusionaryplay \-zhə-ˌner-ē\ adjective
Examples of delusion in a Sentence
He has delusions about how much money he can make at that job.
He is living under the delusion that he is incapable of making mistakes.
She is under the delusion that we will finish on time.
As the illness progressed, his delusions took over and he had violent outbursts.
Recent Examples of delusion from the Web
The public prefers, indeed seems to insist on, the precedent set by Rocky Marciano, who quit undefeated, kept self-delusion at bay.
Anyway, the notion that a class cure can be had for a nationalist disease was the persistent, tragic delusion of progressive politics throughout the twentieth century.
The empty hotel seems like the perfect symbol for the isolated Communist nation with delusions of grandeur.
That paranoia — an ugly delusion that inverts the actual history of slavery — was unfounded.
After all, a metropolis is made up not just of stone and steel but of stories: the dreams and delusions of private lives in close proximity, and the public mythologies that ignite them.
First of all, Tailgunner Ted Cruz of Texas is said to be having delusions of grandeur.
Under no circumstances should anyone be under the delusion that America is running this show.
The same obsessive behavior once used to attain political capital is then turned to amassing personal fortune, but the illusion (delusion?) of someday running for and winning the presidency is never dropped.
These example sentences are collected from online sources. Help us improve them by sending feedback.
Origin and Etymology of delusion
Middle English, from Late Latin delusion-, delusio, from deludere —see delude
First Known Use: 15th century
Synonym Discussion of delusion
DELUSION Defined for English Language Learners
Definition of delusion for English Language Learners
: a belief that is not true : a false idea
: a false idea or belief that is caused by mental illness
DELUSION Defined for Kids
Definition of delusion for Students
: a false belief that continues in spite of the facts “You might be laboring under the delusion that the entire … world is impressed with you …” — J. K. Rowling, Goblet of Fire
Medical Definition of delusion
1a: the act of deluding : the state of being deludedb: an abnormal mental state characterized by the occurrence of psychotic delusions
Learn More about delusion
Seen and Heard
What made you want to look up delusion? Please tell us where you read or heard it (including the quote, if possible).