Webster's English Dictionary

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lunacy

Cross references:
  1. insanity              
 
lu.na.cy \'lu:-n*-se-\ n [lunatic] 1a: insanity interrupted by lucid 
   intervals  1b: any of various forms of insanity  1c: insanity amounting to 
   lack of capacity or of responsibility in the eyes  of the law 2: wild 
   foolishness : extravagant folly