A very successful transaction or business agreement; a bargain. For example, The new agent got him a great deal , or Only $50,000 for all that land? That's a good deal . [ Colloquial ; mid-1800s]

A large but indefinite quantity, as in He has a good (or great ) deal of money ; also, to a large extent or degree, as in “I bled ... a great deal” (from Daniel Defoe's Robinson Crusoe , 1719). Also see good many .