Delusion is a belief that is false, fanciful or derived from deception. In psychiatry, a false belief strongly held in spite of evidence that it is not true, especially as a symptom of a mental illness. 

Delusion is a false belief that is impervious to evidence or reason. Often a symptom of psychosis.

Webster Dictionary Meaning

1. Delusion
- The act of deluding; deception; a misleading of the mind.
- The state of being deluded or misled.
- That which is falsely or delusively believed or propagated; false belief; error in belief.
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