n, pl  -cies  :  the quality or state of not being sufficient: as  a  :  lack of adequate supply of something <an of vitamins>   b  :  lack of physical power or capacity : esp  :  inability of an organ or bodily part to function normally <renal >  <pulmonary >  - compare AORTIC REGURGITATION  in*suf*fi*cient adj 
 
 
 
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