depreciation

noun | \ di-ˌprē-shē-ˈā-shən \ | de·pre·ci·a·tion

1. : 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

2. : a loss in the value of property due to physical deterioration and wear or to obsolescence and lack of adaptability