[ sep-til-yuh n ]
/ sɛpˈtɪl yən /
noun, plural sep·til·lions, (as after a numeral) sep·til·lion.
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.
Related formssep·til·lionth, noun, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for septillion
/ (sɛpˈtɪljən) /
noun plural -lions or -lion
(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
Derived Formsseptillionth, adjective, noun
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