"delusion" in the noun sense
1. delusion, psychotic belief
psychology) an erroneous belief that is held in the face of evidence to the contrary
2. delusion, hallucination
a mistaken or unfounded opinion or idea
"he has delusions of competence"
"his dreams of vast wealth are a hallucination"
3. delusion, illusion, head game
the act of deluding deception by creating illusory ideas
Source: WordNet® (An amazing lexical database of English)
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