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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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
Also, look out for yellow leaves from iron deficiency in come soils.
Integrated programs that teach students both urban and conservation-planning
  principles will be key to overcoming this deficiency.
Blood loss is the prime suspect for iron deficiency.
That's not really an insult as much as a statement of deficiency in one area.
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