delusion - definition and synonyms

noun 

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/dɪˈluːʒ(ə)n/
singulardelusion
pluraldelusions
  1. 1
    [countable/uncountable] formal an idea or belief that is not true
  2. 2
    [uncountable] medical a mental condition in which you believe things that are not true
    1. a.
      [countable] an idea caused by this condition

derived word

delusional

adjective