automaton

Short definition from Wiktionary

Noun

1. 1
   A machine or robot designed to follow a precise sequence of instructions.
2. 2
   A person who acts like a machine or robot, often defined as having a monotonous lifestyle and lacking in emotion.
3. 3
   A formal system, such as a finite-state machine or cellular automaton.
4. 4
   A toy in the form of a mechanical figure.
5. 5
   The self-acting power of the muscular and nervous systems, by which movement is effected without intelligent determination.