Delusion
WordNet
noun
(1) The act of deluding; deception by creating illusory ideas
(2) A mistaken or unfounded opinion or idea
"He has delusions of competence"
"His dreams of vast wealth are a hallucination"
(3) (psychology) an erroneous belief that is held in the face of evidence to the contrary
WiktionaryText
Noun
- A false belief that is resistant to confrontation with actual facts.
- The state of being deluded or misled.
- That which is falsely or delusively believed or propagated; false belief; error in belief.