A machine built to carry out some complex task or group of tasks by physically moving, especially one which can be programmed. [from 20th c.]
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We have a robot in the house that does the vacuuming.
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It's painfully slow and complex work which has never been attempted before in these conditions: the small box-shaped robots, equipped with two claws, are operating in almost freezing water 5,000ft below the surface, in pitch black and strong currents.