Webster's English Dictionary

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enigma

Cross references:
  1. mystery               
 
enig.ma \i-'nig-m*\ n [L aenigma, fr. Gk ainigmat-, ainigma, fr. 
   ainissesthai] to speak in riddles, fr. ainos fable 1: an obscure speech or 
   writing  2: something hard to understand or explain  3: an inscrutable or 
   mysterious person