柯林斯英汉双解大辞典
delusion /dɪˈluːʒən/
1.
可数名词 A delusion is a false idea. 错觉
例:
I was under the delusion that he intended to marry me.
我有一种错觉,他要娶我。
2.
不可数名词 Delusion is the state of believing things that are not true. 妄想
例:
Insinuations about her mental state, about her capacity for delusion, were being made.
当时有对她的精神状态的影射——说她有妄想症的影射。