Noun
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an adequate quantity
a quantity that is large enough to achieve a purpose
"enough is as good as a feast"
"there is more than a sufficiency of lawyers in this country"
Adjective
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sufficient for the purpose
"an adequate income"
"the food was adequate"
"a decent wage"
"enough food"
"food enough"
Adverb
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as much as necessary
"Have I eaten enough?"
(`plenty' is nonstandard) "I've had plenty, thanks"