noun, plural de·fi·cien·cies.

  1. the state of being deficient; lack; incompleteness; insufficiency.
  2. the amount lacked; a deficit.

noun plural -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

1630s, from deficience (mid-15c.) + -cy; or from Late Latin deficientia, from deficientem (see deficient).


  1. A lack or shortage of something essential to health; an insufficiency.
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