n. or adj. A large number (of); very many. Used with "a". We found some fall flowers, but the frost had already killed a good many. A great many of the houses were knocked down by the earthquake. Tom has a good many friends at school. Mary has a great many ideas for interesting programs.
Synonym: QUITE A FEW.
Compare: A LOT, ANY NUMBER, GOOD DEAL.
Antonym: A FEW.