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 ;