We found 4 dictionaries that define the word a great many:

General (2 matching dictionaries)

1. a great many: Wiktionary
2. a great many: TheFreeDictionary.com

Business (1 matching dictionary)

3. a great many: Legal dictionary

Miscellaneous (1 matching dictionary)

4. a great many: Idioms

▸ Words similar to a great many ▸ Usage examples for a great many ▸ Idioms related to a great many ▸ Wikipedia articles (New!) ▸ Words that often appear near a great many ▸ Rhymes of a great many ▸ Invented words related to a great many