From The Collaborative International Dictionary of English v.0.44 [gcide]:
Hallucination \Hal*lu'ci*na"tion\ (-n[=a]"sh[u^]n), noun [L. hallucinatio: cf. F. hallucination.]
1. The act of hallucinating; a wandering of the mind; error; mistake; a blunder.
This must have been the hallucination of the transcriber. --Addison.
2. (Med.) The perception of objects which have no reality, or of sensations which have no corresponding external cause, arising from disorder of the nervous system, as in delirium tremens; delusion.
Hallucinations are always evidence of cerebral derangement and are common phenomena of insanity. --W. A. Hammond.
From WordNet (r) 2.0 [wn]:
noun
1: illusory perception; a common symptom of severe mental disorder
2: a mistaken or unfounded opinion or idea; "he has delusions of competence"; "his dreams of vast wealth are a hallucination" [syn: {delusion}]
3: an object perceived during a hallucinatory episode; "he refused to believe that the angel was a hallucination"
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
95 Moby Thesaurus words for "hallucination": aberration, agnosia, apparition, bamboozlement, befooling, block, blocking, bluffing, brainchild, bubble, calculated deception, chimera, circumvention, conning, deceiving, deception, deceptiveness, defrauding, delirium, delirium tremens, delusion, delusion of persecution, delusiveness, disorientation, dream, dupery, eidolon, enmeshment, ensnarement, entanglement, entrapment, fallaciousness, fallacy, falseness, fancy, fantasque, fantasy, fata morgana, fiction, figment, flight of ideas, flimflam, flimflammery, fond illusion, fooling, ghost, hallucinosis, hoodwinking, idle fancy, illusion, imagery, imagination, imagining, insubstantial image, invention, kidding, maggot, make-believe, mental block, mental confusion, mind-expansion, mirage, myth, nihilism, nihilistic delusion, outwitting, overreaching, paralogia, phantasm, phantom, psychological block, putting on, romance, self-deception, sick fancy, snow job, song and dance, spoofery, spoofing, subterfuge, swindling, thick-coming fancies, trickiness, tricking, trip, tripping, vapor, victimization, vision, whim, whimsy, wildest dreams, willful misconception, wishful thinking, wraith
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