delusion
//dɪˈluːʒən//
Noun
delusionSingular
delusionsPlural
1
A false belief or opinion held despite clear evidence to the contrary.
He was under the delusion that everyone admired him.
2
A psychiatric symptom characterized by persistent false beliefs that are resistant to reason or confrontation with actual fact.
The patient suffers from delusions of persecution, believing that strangers are constantly watching him.
3
The act of deluding or the state of being deluded.
His delusion by the con artist cost him his life savings.