Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun delusion

3 senses of delusion

Sense 1
delusion, psychotic belief -- ((psychology) an erroneous belief that is held in the face of evidence to the contrary)
       => psychological state, psychological condition, mental state, mental condition -- ((psychology) a mental condition in which the qualities of a state are relatively constant even though the state itself may be dynamic; "a manic state")

Sense 2
delusion, hallucination -- (a mistaken or unfounded opinion or idea; "he has delusions of competence"; "his dreams of vast wealth are a hallucination")
       => misconception -- (an incorrect conception)

Sense 3
delusion, illusion, head game -- (the act of deluding; deception by creating illusory ideas)
       => deception, deceit, dissembling, dissimulation -- (the act of deceiving)