Webster's English Dictionary

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illusion

Cross references:
  1. delusion              
 
il.lu.sion \il-'u:-zh*n\ \-'u:zh-n*l, -*n-*l\ \il-'u:-zh*-.ner-e-\ n [ME, 
   fr. MF, fr. LL illusion-, illusio, fr. L, action of mocking, f]r. illusus, 
   pp. of illudere to mock at, fr. in- + ludere to play, mock - more at 
   LUDICROUS obs  1a: the action of deceiving  1b1: the state or fact of being 
   intellectually deceived or misled : MI SAPPREHENSION 1b2: an instance of 
   such deception  2a1: a misleading image presented to the vision  2a2: 
   something that deceives or misleads intellectually  2b1: perception of 
   something objectively existing in such a way as to cause  misinterpretation 
   of its actual nature 2b2: HALLUCINATION  2b3: a pattern capable of 
   reversible perspective  3: a fine plain transparent bobbinet or tulle usu. 
   made of silk and used fo r veils, trimmings, and dresses - il.lu.sion.al aj