monetary unit: 1. The integer printed on the paper currency note. 2. The only part of the original currency note that survives, when we use paper, plastic, electronic and other forms of monetary equivalents to transmit or record money. 3. The only part of the original currency note that survives, when we create financial instruments such as mortgages, bonds, etc. 4. In the nominal monetary system, the vector that carries inflation (and deflation) throughout our monetary system, when it violates the concept of whole numbers by representing less (inflation) or more (deflation) purchasing power over time. 5. In the real monetary system, a real, constant or whole unit of purchasing power, which is adjusted for inflation and deflation over time.