jillion

[jil-yuhn] Informal.
noun
1.
an indefinitely vast number; zillion.
adjective
2.
of or noting such a quantity: a jillion problems.

Origin:
1940–45; expressive formation based on million, billion, etc.

jillionth, noun, adjective
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World English Dictionary
jillion (ˈdʒɪljən)
 
n
informal an extremely large number or amount: jillions of pounds
 
[C20: fanciful coinage based on million, billion, etc]
 
'jillionth
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

jillion
1942, arbitrary coinage, modeled on million.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There must be a jillion people wandering around at any one time with cameras of one sort or another.
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