Unlike the shape of the Earth, there is no truth of the matter regarding what a word means except common usage. In certain cases a word might have a technical

Unlike the shape of the Earth, there is no truth of the matter regarding what a word means except common usage. In certain cases a word might have a technical definition beyond the usual consensus but 'autopilot' isn't one of those words and communications to the public in, say, an advertisement have to use the common meaning of words.