Frequency: The word is one of the 3000 most common words in English.
1.
If there is ~ of something, there is a large amount of it. If there are ~ of things, there are many of them. Plenty is used especially to indicate that there is enough of something, or more than you need.
There was still ~ of time to take Jill out for pizza...
Most businesses face ~ of competition...
Are there ~ of fresh fruits and vegetables in your diet?
QUANT: QUANT of n-uncount/pl-n
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Plenty is also a pronoun.
I don’t believe in long interviews. Fifteen minutes is ~...
PRON
2.
Plenty is a situation in which people have a lot to eat or a lot of money to live on. (FORMAL)
You are all fortunate to be growing up in a time of peace and ~.
N-UNCOUNT
3.
You use ~ in front of adjectives or adverbs to emphasize the degree of the quality they are describing. (INFORMAL)
The water looked ~ deep...
The compartment is ~ big enough...
ADV: ADV adj/adv emphasis