delusions

'delusions'

[delusion.n.01] as in: (psychology) an erroneous belief that is held in the face of evidence to the contrary

'delusions'

[delusion.n.02] as in: a mistaken or unfounded opinion or idea

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Examples:
he has delusions of competence
his dreams of vast wealth are a hallucination

'delusions'

[delusion.n.03] as in: the act of deluding; deception by creating illusory ideas