accumulated depreciation
US /əˌkjuːmjəleɪtɪd dɪˌpriːʃiˈeɪʃən/
UK /əˌkjuːmjəleɪtɪd dɪˌpriːʃiˈeɪʃən/

1.
The total depreciation of an asset that has been charged as an expense since the asset was acquired.
:
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The balance sheet showed a high amount of accumulated depreciation for the old machinery.
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Understanding accumulated depreciation is crucial for assessing an asset's book value.