No, there is a definition: Money is a commonly accepted medium of exchange. The problem is not that there is no accepted definition of money, but rather that th

No, there is a definition: Money is a commonly accepted medium of exchange. The problem is not that there is no accepted definition of money, but rather that this definition actually encompasses a very broad class of assets, each of which has some interesting and unique characteristics that can be defined independently of the definition of money. Talking about "money" by itself is often not specific or helpful enough for the subject at hand. Mises does an excellent job of defining a taxonomy for money and money substitutes in his book The Theory of Money and Credit.