1The right to enjoy the benefits derived from ownership of property, both real and personal. 2 A habitual practice, such as drug use. 3 A purpose or an end served; for example, a screwdriver's use is tightening or loosening screws. 4The purpose for which something is adapted; for example, neighbors complaining of the owner's use of the building to give trumpet lessons. n. useful life An estimation of the amount of time that exhaustible property will generate income. It is used to calculate de...