delusion

US /dɪˈluʒən/

UK /dɪˈlu:ʒn/

B2
n. (c./u.)Noun (Countable/Uncountable)False belief despite evidence to the contrary
What you see is a delusion planned to deceive you
n. (c./u.)Noun (Countable/Uncountable)(Psychiatry) A persistent false belief held in the face of evidence to the contrary, especially as a symptom of mental illness.
Delusions are a common symptom of schizophrenia.

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