I specifically mentioned legal definitions because I moderate the legal section of a motorcycle message board, in Canada, and more than once I have had to direct people to the "definitions" section of a statute because the word they're hinging their choices on doesn't mean what they think it means. For example the term "vehicle" in our Highway Traffic Act also includes bicycles and ebikes. "I can't be charged for going the wrong way down a one way street, on my bicycle!" Um, yeah, you can. All "vehicles" must comply, not just the subset known as "motor vehicles."