zil·lion

[zil-yuhn] noun, plural zil·lions ( as after a numeral ) zil·lion, adjective Informal.
noun
1.
an extremely large, indeterminate number.
adjective
2.
of, pertaining to, or amounting to a zillion.

Origin:
1930–35; jocular alteration of million, billion, etc.

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
zillion (ˈzɪljən) [Click for IPA pronunciation guide]
 
n , pl -lions, -lion
1.  (often plural) an extremely large but unspecified number, quantity, or amount: zillions of flies in this camp
 
determiner
2.  a.  amounting to a zillion: a zillion different problems
 b.  (as pronoun): I found a zillion 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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00:10
Zillion is always a great word to know.
So is quincunx. Does it mean:
the offspring of a zebra and a donkey.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Etymonline
Word Origin & History

zillion
1944, arbitrary coinage with no definite numerical value; first recorded in Damon Runyon.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Or perhaps they chopped up his chart to print more zillion dollar bills on the
  reverse.
But, they'd never in a zillion years use a giant telescope to justify funding
  development a giant lift vehicle.
So the university created a branding campaign that emphasizes its students'
  involvement in a zillion different activities.
We also collected blue crabs, shore shrimp, and a zillion comb jellies.
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