William, apart from the question of definition, it is also important to see the differences between things that are colloquially described as “money”. For example, you can own a piece of gold outright, and this ownership does not depend on anyone (unless such ownership is made illegal, as it was in the USA at one stage — but that’s another story.) On the other hand, the value of a dollar depends ultimately on the credit of the U.S. government. A dollar is not a thing that you can own, but a contract to which you are a party: that is a fundamental difference!