Webster's English Dictionary

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orgy

or.gy \'o.r-je-\ n [MF orgie, fr. L orgia, pl., fr. Gk; akin to Gk ergon 
   work m more at WORK 1: secret ceremonial rites held in honor of an ancient 
   Greek or Roman deity  and usu. characterized by ecstatic singing and 
   dancing 2: drunken revelry  3: an excessive indulgence in an activity