Definition of "delusion" in English

noun

1. A false belief that is resistant to confrontation with actual facts.

2. The state of being deluded or misled, or process of deluding somebody.

   • It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring.

3. That which is falsely or delusively believed or propagated; false belief; error in belief.

4. A fixed, false belief, that will not change, despite evidence to the contrary.