1. a false belief or opinion that is resistant to reason or confrontation with actual fact
2. the act or process of deluding; deception
3. a persistent false psychotic belief regarding the self or persons or objects outside the self
Usage: psychology; psychiatry

Examples

• He lived under the delusion that he was a famous actor.
• The patient suffered from delusions of grandeur.
• It’s a common delusion that money brings happiness.
• She clung to the delusion that he would return.
• His delusion about his abilities led to poor decisions.
• The conspiracy theory was based on pure delusion.
• Breaking free from delusion requires facing reality.