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2.
A very large quantity.
We have an exponential amount of explosives in my garage.
by Gary Coleman IV June 17, 2008
 
1.
Applies to any rate of growth which is larger than some expected rate of growth.

In common usage, however, only a small sample size is available, and exponential applies to sufficiently large positive rate of growth.

In mathematical terms, exponential growth is "superlinear"
Person 1: The number of African American presidents in the US is growing exponentially.

Person 2: That's right!

Person 1: The ant population in my kitchen seems to double every week.

Person 2: Oh... well at least it's not growing exponentially

Person 3: x log x grows exponentially.
by FineHall October 14, 2009