What is the meaning of great deal?
Similarly, you may ask, what is a great deal?
a great deal - to a very great degree or extent; "I feel a lot better"; "we enjoyed ourselves very much"; "she was very much interested"; "this would help a great deal" a good deal, a lot, lots, very much, much. 2. a great deal - frequently or in great quantities; "I don't drink much"; "I don't travel much" often, much.
Subsequently, one may also ask, what is the meaning of good deal?
1. A large but indefinite quantity, as in He has a good (or great) deal of money; also, to a large extent or degree, as in “I bled a great deal” (from Daniel Defoe's Robinson Crusoe, 1719). Also see good many. 2. A very successful transaction or business agreement; a bargain.
Formal styles: a great deal of, a good deal of, a large number. We prefer to use expressions like a great deal of (+ singular uncountable nouns) or a large number of (+ plural nouns) in more formal styles: There's a great deal of truth in what he said.