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History
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Meaning:

the act, state, of deluding or being deluded; a false opinion or belief, especially one that may be a symptom of madness

misconception, misbelief

deception fantasy hallucination illusion pipe dream apparition blunder casuistry chicanery daydream deceptiveness dream error fallacy fancy figment ghost lapse mirage misapprehension mistake oversight phantasm phantom self-deception shade speciousness spuriousness trickery trip vision eidolon false impression fool's paradise head trip ignis fatuus optical illusion
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DELUSION as in Wiktionary
DELUSION as in Wikipedia