What is Much?

Much definition and meaning on Dictionary terms:
adjective, more, most.
great in quantity, measure, or degree: too much cake.

a great quantity, measure, or degree: Much of his research was unreliable.
a great, important, or notable thing or matter: The house is not much to look at.

adverb, more, most.
to a great extent or degree; greatly; far: to talk too much; much heavier.
nearly, approximately, or about: This is much like the others.