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 →
3 the act of deluding or state of being deluded
English Collins Dictionary - English Definition & Thesaurus
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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"