Longman Dictionary of Contemporary English homepage

delusion

 noun
     
Related topics: Illness and Disability, Psychology, Psychiatry
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
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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