noun, plural septillions (as after a numeral) septillion.
a cardinal number represented in the U.S. by 1 followed by 24 zeros, and in Great Britain by 1 followed by 42 zeros.
amounting to one septillion in number.

1680–90; < French, equivalent to sept seven + -illion, as in million

septillionth, noun, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
septillion (sɛpˈtɪljən)
n , pl -lions, -lion
1.  (in Britain, France, and Germany) the number represented as one followed by 42 zeros (1042)
2.  Brit word: quadrillion (in the US and Canada) the number represented as one followed by 24 zeros (1024)
[C17: from French, from sept seven + -illion, on the model of million]
adj, —n

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