Webster's English Dictionary

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automaton

au.tom.a.ton \o.-'ta:m-*t-*n, -*-.ta:n\ \-*t-*\ n or automatons or 
   au.tom.a.ta [L, fr. Gk, neut. of automatos] pl  1: a mechanism that is 
   relatively self-operating; esp : ROBOT  2: a machine or control mechanism 
   designed to follow automatically a predet ermined sequence of operations or 
   respond to encoded instructions 3: a creature who acts in a mechanical 
   fashion