- 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.
Origin of septillion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- (in Britain, France, and Germany) the number represented as one followed by 42 zeros (10 42)
- (in the US and Canada) the number represented as one followed by 24 zeros (10 24)Brit word: quadrillion
Word Origin for septillion
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
Word Origin and History for septillion
Online Etymology Dictionary, © 2010 Douglas Harper