delusion > define

noun

• Psychology) an erroneous belief that is held in the face of evidence to the contrary.
  • synonyms: psychotic belief
• A mistaken or unfounded opinion or idea.
  • usage: "he has delusions of competence"; "his dreams of vast wealth are a hallucination"
  • synonyms: hallucination
• The act of deluding; deception by creating illusory ideas.
  • synonyms: illusion, head game

• (n.) The act of deluding; deception; a misleading of the mind.
• (n.) That which is falsely or delusively believed or propagated; false belief; error in belief.
• (n.) The state of being deluded or misled.