a sensory experience of something that does not exist outside the mind, caused by various physical and mental disorders, or by reaction to certain toxic substances, and usually manifested as visual or auditory images.
the sensation caused by a hallucinatory condition or the object or scene visualized.
a false notion, belief, or impression; illusion; delusion.

1640–50; < Latin hallūcinātiōn- (stem of (h)allūcinātiō) a wandering of the mind. See hallucinate, -ion

hallucinational, hallucinative [huh-loo-suh-ney-tiv, -nuh-tiv] , adjective
nonhallucination, noun

allusion, delusion, elusion, hallucination, illusion (see synonym study at illusion).

1. phantasm, aberration. See illusion.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hallucination (həˌluːsɪˈneɪʃən)
the alleged perception of an object when no object is present, occurring under hypnosis, in some mental disorders, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hallucination hal·lu·ci·na·tion (hə-lōō'sə-nā'shən)

  1. False or distorted perception of objects or events with a compelling sense of their reality, usually resulting from a mental disorder or drug.

  2. The objects or events so perceived.

hal·lu'ci·nate' v.
hal·lu'ci·na'tion·al or hal·lu'ci·na'tive adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary

hallucination definition

A false perception that appears to be real, as when, for example, a man dying of thirst in a desert thinks that he sees a lake. (See also delusion.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Perception increases to fill the gap vacated by the senses and gives rise to
  powerful hallucinations.
The mysterious floating orbs might simply be hallucinations caused by brains
  overstimulated by magnetism, a new study suggests.
The drug acts as a stimulant and causes hallucinations and disorientation.
He was subject to epilepsy, and had strange hallucinations.
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