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[kwin-til-yuh n] /kwɪnˈtɪl yən/
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.
Origin of quintillion
1665-75; < Latin quīnt(us) fifth + -illion (as in million)
Related forms
quintillionth, noun, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for quintillion


noun (pl) -lions, -lion
(in Britain, France, and Germany) the number represented as one followed by 30 zeros (1030) US and Canadian word nonillion
(in the US and Canada) the number represented as one followed by 18 zeros (1018) Former Brit word trillion
Derived Forms
quintillionth, adjective
Word Origin
C17: from Latin quintus fifth + -illion, as in million
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for quintillion

1670s, from Latin quintus "the fifth" (see quinque-) + ending from million. 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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