Etymology
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sufficiency (n.)

late 15c., from Late Latin sufficientia, from Latin sufficiens "adequate" (see sufficient) + -cy. Sufficience is from late 14c.

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Definitions of sufficiency

sufficiency (n.)
sufficient resources to provide comfort and meet obligations;
her father questioned the young suitor's sufficiency
sufficiency (n.)
an adequate quantity; a quantity that is large enough to achieve a purpose;
there is more than a sufficiency of lawyers in this country
Synonyms: enough
sufficiency (n.)
the quality of being sufficient for the end in view;
he questioned the sufficiency of human intelligence
Synonyms: adequacy
From wordnet.princeton.edu