How many definitions of the money supply are given?

1. The money supply is measured at more than one width. 2. Economists need a precise measure of how much money exists. 3. There are two definitions of money. 4. They are the M1 and M2 money supply. _Source: OpenStax Principles of Macroeconomics for AP Courses 2e (CC BY 4.0), Ch 13 'Money and Banking'_