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septillion

[sep-til-yuh n] /sɛpˈtɪl yən/
noun, plural septillions (as after a numeral) septillion.
1.
a cardinal number represented in the U.S. by 1 followed by 24 zeros, and in Great Britain by 1 followed by 42 zeros.
adjective
2.
amounting to one septillion in number.
Origin
1680-1690
1680-90; < French, equivalent to sept seven + -illion, as in million
Related forms
septillionth, noun, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for septillion

septillion

/sɛpˈtɪljən/
noun (pl) -lions, -lion
1.
(in Britain, France, and Germany) the number represented as one followed by 42 zeros (1042)
2.
(in the US and Canada) the number represented as one followed by 24 zeros (1024) Brit word quadrillion
Derived Forms
septillionth, adjective, noun
Word Origin
C17: from French, from sept seven + -illion, on the model of 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 septillion
n.

1680s, from sept- (see septi-) + (m)illion. Cf. billion.

Online Etymology Dictionary, © 2010 Douglas Harper
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