depreciation

noun

de·pre·ci·a·tion di-ˌprē-shē-ˈā-shən

: any decrease in the value of property (as machinery) for the purpose of taxation that cannot be offset by current repairs and is carried on company books as a yearly charge amortizing the original cost over the useful life of the property

— accelerated depreciation

: the depreciation of property that was put into use prior to 1980 which is allowed at a faster rate than normal under the depreciation rules in force before the adoption of the Accelerated Cost Recovery System

— straight-line depreciation

: depreciation of an asset by a fixed percentage of its original cost based on its estimated life