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Related to hallucination: auditory hallucination, visual hallucination
See: figment, insanity, phantom

HALLUCINATION, med. jur. It is a species of mania, by which "an idea reproduced by the memory is associated and embodied by the imagination." This state of mind is sometimes called delusion or waking dreams.
     2. An attempt has been made to distinguish hallucinations from illusions; the former are said to be dependent on the state of the intellectual organs and, the latter, on that of those of sense. Ray, Med. Jur. Sec. 99; 1 Beck, med. Jur. 538, note. An instance is given of a temporary hallucination in the celebrated Ben Johnson, the poet. He told a friend of his that he had spent many a night in looking at his great toe, about which he had seen Turks and Tartars, Romans and Carthagenians, fight, in his imagination. 1 Coll. on Lun. 34. If, instead of being temporary, this affection of his mind had been permanent, he would doubtless have been considered insane. See, on the subject of spectral illusions, Hibbert, Alderson and Farrar's Essays; Scott on Demonology, &c.; Bostock's Physiology, vol. 3, p. 91, 161; 1 Esquirol, Maladies Mentales, 159.

References in classic literature ?
Slowly the solid stone sank noiselessly back into the wall--there was no hallucination here.
Either I was being dogged, watched, followed, day and night, indoors and out, or I was the victim of a very ominous hallucination.
Little by little, this hallucination was succeeded by a less bewildered and exaggerating view.
It had been nothing more than a passing hallucination, super-induced by excitement and by personal contact.
Louis, with his eyes open, could not resist the deception of this cruel hallucination.
When now in retrospect the thoughtful observer surveys the intellectual history of this time, when one reads its surviving fragments of literature, its scraps of political oratory, the few small voices that chance has selected out of a thousand million utterances to speak to later days, the most striking thing of all this web of wisdom and error is surely that hallucination of security.
You can force me to talk as if this feeling for you were an hallucination, but all our feelings are that.
Casaubon must have raised some heroic hallucination in her.
Presently he began to hate them and there formed within his half-delirious brain the hallucination that the hills were German hills, that they had slain someone dear to him, whom he could never quite recall, and that he was pursuing to slay them.
For a while they would have doubted your story, thinking it but the nervous hallucination of a woman--had you insisted it would have been too late to have rescued him by the time the ship could have been brought to a stop, and the boats lowered and rowed back miles in search of the unknown spot where the tragedy had occurred.
It was the young man who persists in some strange hallucination as to a certain Mademoiselle Violet.
Once, opening his eyes, he saw what he took to be an hallucination.