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hal·lu·ci·na·tion

n 1  :  a perception of something (as a visual image or a sound) with no external cause usu. arising from a disorder of the nervous system (as in delirium tremens or in functional psychosis without known neurological disease) or in response to drugs (as LSD) - compare DELUSION2 ILLUSION2a    2  :  the object of an hallucinatory perception .
 
 

 
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