depreciation /diˌpri:ʃiˈeiʃən/ n. [u] 折旧，贬值：They wrote off 500 for depreciation of machinery.他们注销了500镑作为机器折旧费。The depreciation of other currencies in Asia has also caused a substantial reduction in tourism.亚洲其他货币贬值，亦严重打击了本港的旅游业。