1. 足量;充足
Sufficiency of something is enough of that thing to achieve a purpose or to fulfil a need.

1. the quality of being sufficient for the end in view

e.g. he questioned the sufficiency of human intelligence

Synonym: adequacy

2. an adequate quantity
a quantity that is large enough to achieve a purpose

e.g. enough is as good as a feast
there is more than a sufficiency of lawyers in this country

Synonym: enough

3. sufficient resources to provide comfort and meet obligations

e.g. her father questioned the young suitor's sufficiency