| 释义 |
depletion|dɪˈpliːʃən|
[ad. L. type *dēplētiōn-em (perh. used in med. or mod.L.), n. of action from dēplēre, dēplēt- to deplete. Cf. mod.F. déplétion (term of medicine) in Littré. (The cl. L. equivalent was dēplētūra.)]
1. The action of depleting, or condition of being depleted; emptying of contents or supplies; exhaustion.
1656Blount Glossogr., Depletion, an emptying. 1852D. G. Mitchell Batte Summer 214 With coffers in the last stages of depletion. 1889Spectator 14 Sept., The depletion of London to the benefit of other English cities.
2. Med. The emptying or relieving of overcharged vessels of the body; reduction of plethora or congestion by medicinal agency; bleeding.
a1735Arbuthnot (J.), Depletion of the vessels gives room to the fluid to expand itself. 1803Med. Jrnl. X. 471 The mode of treatment..was depletion, followed by a mercurial salivation. 1874Van Buren's Dis. Genit. Org. 83 The acute symptoms..yield rapidly to local depletion and sedatives. 1890Times 1 Sept. 7/2 Some blood letting was necessary and natural; but apparently it has gone on so long that a period of depletion has set in.
3. Special Comb. depletion allowance U.S., a tax concession allowable in industries where a company's business operations diminish the value of its property assets, as in oil-drilling, etc.
1932Statutes at Large U.S.A. (1933) XLVII. 202 The depletion allowance based on discovery value provided in this paragraph shall not exceed 50 per centum of the net income of the taxpayer. 1965McGraw-Hill Dict. Mod. Econ. 143 The primary purpose of a depletion allowance is to prevent the imposition of a capital levy on the owners of natural resources. 1974Saturday (Charleston, S. Carolina) 20 Apr. 10-a/5 By the time the well gets me in the black..the depletion allowance will have been killed by Congress and oil fields will be taxed just like wheat fields, which, of course, can produce forever.
Hence deˈpletionist, an advocate of depletion.
1883Sat. Rev. 14 Apr. 464 Two general views on that question [Scotch crofters]..may be summarized by the two words ‘impletionist’ and ‘depletionist’. |