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Deficiency

a lack or defect. Lack of an adequate quantity or number; the inadequacy of unemployment benefits.The state of needing something that is absent or unavailable; there is a serious lack of insight into the problem; water is the critical deficiency in desert regions; for want of a nail the shoe was lost.A shortage of a required element or compound, such as a deficiency in vitamin c in humans leading to the deficiency disease scurvy.