Webster's English Dictionary

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energy

Cross references:
  1. power                 
 
en.er.gy \'en-*r-je-\ n [LL energia, fr. Gk energeia activity, fr. energos 
   active, fr]. en in + ergon work 1: vitality of expression  2: the capacity 
   of acting  3: power forcefully exerted  4: the capacity for doing work