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delusion

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delusion/dɪˈluːʒən/noun
pluraldelusions
delusion
/dɪˈluːʒən/
noun
pluraldelusions
Learner's definition of DELUSION  
[count]
: a belief that is not true : a false idea
: a false idea or belief that is caused by mental illness
◊ If you have delusions of grandeur, you believe that you are much more important than you really are.

— delusional

/dɪˈluːʒənl̟/adjective,[more delusional; most delusional]
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