depreciation Syllabification: (de·pre·ci·a·tion)Pronunciation: /diˌprēSHēˈāSHən/Translate depreciation | into German | into Italian Definition of depreciation noun a reduction in the value of an asset with the passage of time, due in particular to wear and tear. decrease in the value of a currency relative to other currencies:depreciation leads to losses for non-dollar-based investors a currency depreciationdepreciation in other Oxford dictionaries Definition of depreciation in the British & World English dictionary