The noun plenty has 2 senses (first 2 from tagged texts)
1. (13) plenty, plentifulness, plenteousness, plenitude, plentitude -- (a full supply; "there was plenty of food for everyone")
2. (2) batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, muckle, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad, whole lot, whole slew -- ((often followed by `of') a large number or amount or extent; "a batch of letters"; "a deal of trouble"; "a lot of money"; "he made a mint on the stock market"; "it must have cost plenty")
Overview of adv plenty
The adv plenty has 1 sense (first 1 from tagged texts)
1. (6) enough, plenty -- (as much as necessary; "Have I eaten enough?"; (`plenty' is nonstandard) "I've had plenty, thanks")