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A deficiency is a lack of something.
- In mathematics, a deficient number is a number n for which σ(n) < 2n.
- In medicine there are a variety of nutrient deficiencies:
- Avitaminosis is a deficiency of vitamins.
- Boron deficiency (medicine)
- Chromium deficiency
- Iron deficiency (medicine)
- Iodine deficiency
- Magnesium deficiency (medicine)
- In genetics, a genetic deletion is also called a deficiency.
de:Mangel nl:Deficiëntie no:Mangel