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Definition of: automaton
(ô·tom′ə·ton, -tən) noun plural ·tons or ·ta (-tə)
1. A contrivance or apparatus that appears to function of itself by the action of a concealed mechanism.
2. Any living being whose actions are or appear to be involuntary or mechanical.
3. Anything capable of spontaneous movement or action. [ < Gk. automaton, neut. of automatos acting of oneself, independent]