deficˈiency (sometimes deficˈience) noun

1. Defect
2. Shortage
3. The amount which is lacking for completeness
4. The amount by which a non-profit-making organization's annual income falls short of the annual expenditure (bookkeeping)

deficˈiently adverb

deficˈientness noun

deficiency disease noun

A disease due to lack of necessary substances (esp vitamins) in the diet, such as rickets, scurvy, beri-beri, pellagra