- a cardinal number represented in the U.S. by 1 followed by 27 zeros, and in Great Britain by 1 followed by 48 zeros.
- amounting to one octillion in number.
Origin of octillion
1680–90; < French, equivalent to oct- oct- + -illion, as in million
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
- (in Britain and Germany) the number represented as one followed by 48 zeros (10 48)
- (in the US, Canada, and France) the number represented as one followed by 27 zeros (10 27)
Word Origin for octillion
C17: from French, 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