And that meaning changes over time. Words to not intrinsically have meaning, they only mean what we say they mean. This is what makes the Oxford English Dictionary so unique – it shows how words are used, rather than stating what they mean.
This is why Originalism is so important. A word like regulated has a different meaning, given the context, and a more prominent context depending on the time and place where it is used.
See here for example: More on that Well-Regulated Thing http://feedly.com/e/ciShpY9Q