WordWeb Online

1. (quantifier used with mass nouns) great in quantity, degree or extent
   - much, mucho [informal]
    
2. A quantifier that can be used with count nouns and is often preceded by 'as' or 'too' or 'so' or 'that'; amounting to a large but indefinite number; quantifier, plural pronoun; quantifier, plural
   - many

See also: galore, incalculable, legion, many a, many an, many another, more, more than, multiplicity, numerosity, numerous, numerousness, overmuch, some, such, umpteen, umteen [non-standard], untold

Encyclopedia: Beaucoup, Illinois