1
: the act of making a person or thing seem less valuable : the act of depreciating
depreciation of the role of art in school
2
: a decrease in the value of something (as due to deterioration or obsolescence)
specifically : a decrease in the value of property (such as machinery) for the purpose of taxation that is carried as a yearly charge amortizing the original cost over the useful life of the property

Word History

First Known Use

1744, in the meaning defined at sense 2

Time Traveler
The first known use of depreciation was in 1744

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Cite this Entry

“Depreciation.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/depreciation. Accessed 7 Nov. 2025.

Kids Definition

depreciation

noun
de·​pre·​ci·​a·​tion
di-ˌprē-shē-ˈā-shən
1
: a decline in the purchasing power or exchange value of money
2
: the act of making a person or a thing seem little or unimportant : disparagement
3
: a decline (as from age or wear and tear) in the value of something

Legal Definition

depreciation

noun
de·​pre·​ci·​a·​tion di-ˌprē-shē-ˈā-shən How to pronounce depreciation (audio)
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

More from Merriam-Webster on depreciation

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