1.Definition: (psychology) an erroneous belief that is held in the face of evidence to the contrary

Category: General

2.Definition: a mistaken or unfounded opinion or idea

"He has delusions of competence", "His dreams of vast wealth are a hallucination"

Related Noun(s):hallucination

Category: General

3.Definition: the act of deluding; deception by creating illusory ideas

Related Noun(s):illusion

Category: General