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
1680–90; < French, equivalent to sept seven + -illion, as in million
Related forms
septillionth, noun, adjective
British Dictionary definitions for septillion
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]
 
sep'tillionth
 
adj, —n

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