depreciation
US /dɪˌpriː.ʃiˈeɪ.ʃən/
UK /dɪˌpriː.ʃiˈeɪ.ʃən/

1.
a reduction in the value of an asset over time, due in particular to wear and tear or obsolescence.
:
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The car's value suffered significant depreciation over the first three years.
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Businesses account for depreciation to reflect the true value of their assets.
2.
a decrease in the value of a currency relative to other currencies.
:
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The central bank intervened to prevent further depreciation of the national currency.
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High inflation often leads to currency depreciation.