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You can use either of these words to say that someone has a wrong belief.
You say that someone is under an illusion or delusion.
You can also say that someone suffers from an illusion or delusion.
If you have an illusion of something, you believe that it exists when in fact it does not.
An illusion is also something that looks or sounds like one thing, but is either something else or is not there at all.
You do not use delusion with this meaning.
|Noun||1.||delusion - (psychology) an erroneous belief that is held in the face of evidence to the contrary|
mental condition, mental state, psychological condition, psychological state - (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"
delusions of grandeur - a delusion (common in paranoia) that you are much greater and more powerful and influential than you really are
delusions of persecution - a delusion (common in paranoia) that others are out to get you and frustrate and embarrass you or inflict suffering on you; a complicated conspiracy is frequently imagined
hallucination - illusory perception; a common symptom of severe mental disorder
nihilistic delusion, nihilism - the delusion that things (or everything, including the self) do not exist; a sense that everything is unreal
somatic delusion - a delusion concerning the body image or parts of the body
zoanthropy - the delusion that you have assumed the form of an animal
|2.||delusion - a mistaken or unfounded opinion or idea; "he has delusions of competence"; "his dreams of vast wealth are a hallucination"|
misconception - an incorrect conception
|3.||delusion - the act of deluding; deception by creating illusory ideas|
delusion[dɪˈluːʒən] N (= false impression) → engaño m, error m; (= hope) → ilusión f (Psych) → delirio m
delusions of grandeur → delirios mpl de grandeza
to labour under a delusion → abrigar una falsa ilusión
she's labouring under the delusion that she's going to get the job → abriga la falsa ilusión de que va a conseguir el puesto, se engaña pensando que va a conseguir el puesto