robot (Noun) — An intelligent machine designed to look and function like a human being or other creature (esp. in science fiction).
robot (Noun) — A machine built to carry out some complex task, esp. one which can be programmed and with many movable parts.
robot (Noun) — Someone who does not appear to have any emotions. ex. "Being a robot, Jessica didn't even cry"
robot (Noun) — A visual signal to control the flow of traffic at intersections.