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a good deal is an adverb meaning "to a very great degree or extent". It carries one recorded sense.
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”
Definitions, synonyms and semantic relations for a good deal come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.