robot

n. computerized mechanical device designed to perform complicated tasks; automaton, person who acts in a mechanical manner and does not think for himself; traffic light (South African)

A robot is a mechanical or virtual, artificial . It is usually an electromechanical system, which, by its appearance or movements, conveys a sense that it has intent or of its own. The word robot can refer to both physical robots and virtual software agents, but the latter are usually referred to as bots to differentiate.
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Noun
1. a mechanism that can move automatically
(synonym) automaton, golem
(hypernym) mechanism
(hyponym) android, humanoid, mechanical man

n. automaton, robot; self-acting machine; person who behaves mechanically

n. robot, computerized mechanical device designed to perform complicated tasks