Definitions

1. noun

An informal unit of very large quantity, equivalent to one trillion (1,000,000,000,000).

“She has a jillion dollars in her bank account.”

2. adverb

Used to indicate a very large quantity.

“He has a whole jillion books on his shelves.”

3. adjective

Used to describe something that is very large in quantity or amount.

“The company has jillion-dollar deals every year.”