Robot

noun

1. A machine built to carry out some complex task or group of tasks by physically moving, especially one which can be programmed.
2. An intelligent mechanical being designed to look like a human or other creature, and usually made from metal.
3. A person who does not seem to have any emotions.
4. A traffic light (from earlier robot policeman).
5. A theodolite which follows the movements of a prism and can be used by a one-man crew.