delusion

de|lu|sion /dɪl'uːʒən/ (delusions)
1 [N-COUNT] usu with supp
A delusion is a false idea.
I was under the delusion that he intended to marry me.
2 [N-UNCOUNT]
Delusion is the state of believing things that are not true.
This was not optimism, it was delusion.
3 [PHRASE]
If someone has delusions of grandeur, they think and behave as if they are much more important or powerful than they really are.

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