noun, plural quintillions (as after a numeral) quintillion.
a cardinal number represented in the U.S. by 1 followed by 18 zeros, and in Great Britain by 1 followed by 30 zeros.
amounting to one quintillion in number.

1665–75; < Latin quīnt(us) fifth + -illion (as in million)

quintillionth, noun, adjective
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World English Dictionary
quintillion (kwɪnˈtɪljən)
n , pl -lions, -lion
1.  US and Canadian word: nonillion (in Britain, France, and Germany) the number represented as one followed by 30 zeros (1030)
2.  Former Brit word: trillion (in the US and Canada) the number represented as one followed by 18 zeros (1018)
[C17: from Latin quintus fifth + -illion, as in million]

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

1674, from L. quintus "fifth" + (m)illion. Cf. billion. In Great Britain, the fifth power of a million (1 followed by 30 zeroes); in U.S. the sixth power of a thousand (1 followed by 18 zeroes).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

quintillion definition

10^30 in Europe (this is called a nonillion in the United States and Canada).
10^18 in the United States and Canada (this is called a trillion in Europe).
[Collins dictionary].

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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