delusional definition, delusional meaning | English dictionary

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1    a mistaken or misleading opinion, idea, belief, etc.  
he has delusions of grandeur     
2      (Psychiatry)   a belief held in the face of evidence to the contrary, that is resistant to all reason  
   See also       illusion       hallucination  
3    the act of deluding or state of being deluded  
   delusional             adj  
  delusive      adj  
  delusively      adv  
  delusiveness      n  
  delusory      adj  
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"