Webster's English Dictionary

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agent

Cross references:
  1. mean                  
 
agent \'a--j*nt\ n [ME, fr. ML agent-, agens, fr. L, prp. of agere to 
   drive, lea]d, act, do; akin to ON aka to travel in a vehicle, Gk agein to 
   drive, lead 1a: something that produces or is capable of producing an 
   effect : an act ive or efficient cause 1b: a chemically, physically, or 
   biologically active principle  2: one that acts or exerts power  3: a 
   person responsible for his acts  4: MEANS Instrument  5: one who acts for 
   or in the place of another by authority from him