Webster's English Dictionary

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hallucination

Cross references:
  1. delusion              
 
hal.lu.ci.na.tion \h*-.lu:s-*n-'a--sh*n\ \-shn*l, -sh*n-*l\ 
   \-'lu.s-*n-.a-t-iv\ n 1: perception of objects with no reality usu. arising 
   from disorder of the  nervous system 2: the object of a hallucinatory 
   perception  - hal.lu.ci.na.tion.al aj