noun Informal.
an extremely large, indeterminate number.

ga-, variant of ka- + zillion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To gazillion
World English Dictionary
gazillion (ɡəˈzɪljən)
n , pl -lions, -lion
1.  (often pl) an extremely large but unspecified number, quantity, or amount: gazillions of people turned up
2.  a.  amounting to a gazillion: a gazillion types to choose from
 b.  (as pronoun): I found a gazillion under the sink
[C20: on the model of million]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Forget the launchpads, the giant rockets, and the gazillion-dollar prices for getting satellites into space.
It adds support for a lot of new cameras and old lenses, but more importantly,
  it squashes roughly a gazillion bugs.
But he's the one with the twinkle in his eye and the pampered, cosseted look of
  a star beloved by a gazillion fans.
Even with a gazillion bits per second, a human being can still only process so
  much info.
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