Definition of deficiency noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//dɪˈfɪʃnsi//
    ; NAmE NAmE//dɪˈfɪʃnsi//
    (pl. deficiencies) (formal)
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  1. 1[uncountable, countable] deficiency (in/of something) the state of not having, or not having enough of, something that is essential synonym shortage Vitamin deficiency in the diet can cause illness. a deficiency of Vitamin B
  2. 2[countable] deficiency (in/of something) a fault or a weakness in something/somebody that makes it or them less successful deficiencies in the computer system
  3. Extra examples He’s suffering from a severe vitamin deficiency. I’ve been prescribed iron tablets to make up the deficiency. Lack of sunlight can cause deficiency in vitamin D. These symptoms indicate a protein deficiency. serious deficiencies in the health service He considers the lack of central control to be a serious deficiency. The condition is caused by a deficiency of calcium. The deficiencies in their argument are easy to spot. The deficiencies of medical care in poorer areas are many. Unless these underlying deficiencies are rectified the system can never be efficient.
See the Oxford Advanced American Dictionary entry: deficiency

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