Dictionary.com

octillion

[ ok-til-yuhn ]
/ ɒkˈtɪl yən /
Save This Word!

noun, plural oc·til·lions, (as after a numeral) oc·til·lion.
a cardinal number represented in the U.S. by 1 followed by 27 zeros, and in Great Britain by 1 followed by 48 zeros.
adjective
amounting to one octillion in number.
QUIZ
CUDDLE UP! A COZY QUIZ ON FALL WORDS HAS ARRIVED
If autumn is your ideal season, spice up your repertoire of "fall" vocabulary with this quiz on some warm and vivid descriptive words for the season.
Question 1 of 10
Which of the following words means “to make a crackling sound; crackle”?
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of octillion

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

OTHER WORDS FROM octillion

oc·til·lionth, noun, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for octillion

octillion
/ (ɒkˈtɪljən) /

noun
(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)

Derived forms of octillion

octillionth, adjective

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
FEEDBACK