I see your point, but I think that complexity is key (and I think that definition 3 is far too over-broad, unless you require minimal complexity of the mechanis

I see your point, but I think that complexity is key (and I think that definition 3 is far too over-broad, unless you require minimal complexity of the mechanism or pay close attention to the plurality of "controls"). The problem with categorizing anything with a sensor and actuator as the proper study of robotics means that very little is excluded. We wouldn't be impressed if a car salesman claimed that the automated dash-light dimmer is a "robot" (even if he had a well-researched semantic argument), and I don't think the term is applicable in this case.