noun, plural deficiencies.
the state of being deficient; lack; incompleteness; insufficiency.
the amount lacked; a deficit.

1625–35; < Late Latin dēficientia, Latin dēficient- (stem of dēficiēns). See deficient, -ency

nondeficiency, noun, plural nondeficiencies.
predeficiency, noun, plural predeficiencies.

1. shortage, inadequacy, paucity, scarcity. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deficiency (dɪˈfɪʃənsɪ)
n , pl -cies
1.  the state or quality of being deficient
2.  a lack or insufficiency; shortage
3.  another word for deficit
4.  biology the absence of a gene or a region of a chromosome normally present

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1630s, from deficience (c.1600), from L.L. deficientia, from deficientem (see deficient).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

deficiency de·fi·cien·cy (dĭ-fĭsh'ən-sē)
A lack or shortage of something essential to health; an insufficiency.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Eliminating foods from your diet can increase the risk of nutritional
What happened was a predictable outcome of known deficiencies in the type of
  nuclear equipment installed there.
The structural defects were equalled by the deficiencies in the commonest
  objects of hospital use.
Perhaps the invigorating climate of the mountain camp was compensation for
  material deficiencies.
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