English version

useful life

From Longman Business Dictionaryuseful lifeˌuseful ˈlifeACCOUNTING the period of time during which something can be used, before it becomes too old or in too bad condition. The useful life of an asset is important in calculating DEPRECIATION (=the amount it falls in value over time)The average recommended useful life for such small appliances is six to seven years. life
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