delusion

US /dɪˈluː.ʒən/
UK /dɪˈluː.ʒən/
"delusion" picture
1.

妄想, 错觉

a belief that is not true and is not based on reality, especially as a symptom of mental illness

:
He suffers from the delusion that he is a famous rock star.
他患有自己是著名摇滚明星的妄想
It was a common delusion among the patients.
这是患者中常见的妄想
2.

错觉, 欺骗

the state of being deceived or misled

:
He was under the delusion that he could fly.
他有自己能飞的错觉
Living in a constant state of delusion can be dangerous.
生活在持续的错觉中可能是危险的。