|Look up deficiency in Wiktionary, the free dictionary.|
A deficiency is generally a lack of something. It may also refer to:
- A deficient number, in mathematics, a number n for which σ(n) < 2n
- Angular deficiency, in geometry, the difference between a sum of angles and the corresponding sum in a Euclidean plane
- Deficiency (medicine), including various types of malnutrition, as well as genetic diseases caused by deficiencies of endogenously produced proteins.
- A deficiency in construction, an item, or condition that is considered sub-standard, or below minimum expectations
- Genetic deletion, in genetics, is also called a deficiency
- A deficiency judgment, in the law of real estate
- A tax deficiency, an amount owed in taxes over and above what has been submitted in payment
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