Longman Dictionary of Contemporary English homepage

delusion

noun
     
de‧lu‧sion
1 [uncountable and countable] a false belief about yourself or the situation you are in
under a delusion (that)
He is under the delusion that I am going to cheat him.
2

delusions of grandeur

the belief that you are much more important or powerful than you really are
delusive adjective
delusional adjective

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