Answer:
Expenditures making a plant asset more efficient or productive.
Step-by-step explanation:
A betterment in domain of accounting can be regarded as capital expenditure that brings about the improvements of the quality or that brings about extension of the life of an asset, these could be an upgrade of a production capacity of a machine. A betterment is quite different compare to normal repair as well as maintenance expenses. It should be noted that Betterments are Expenditures making a plant asset more efficient or productive.