Meaning of enough

(adj) sufficient for the purpose; "an adequate income"; "the food was adequate"; "enough food"; "food enough"

(adv) as much as necessary; "Have I eaten enough?"; (`plenty' is nonstandard) "I've had plenty, thanks"

(noun) 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"