oc·​til·​lion | \ äk-ˈtil-yən How to pronounce octillion (audio) \

Definition of octillion

US : a number equal to 1 followed by 27 zeros — see Table of Numbers also, British : a number equal to 1 followed by 48 zeros — see Table of Numbers

Examples of octillion in a Sentence

Recent Examples on the Web The odds of the suspect not being Blankenship, according to this match, is 1 in 3 octillion. Kevin Grasha, Cincinnati.com, 11 Feb. 2020 To put that in perspective, an octillion is a one with 27 zeros after it. Jared Gilmour, miamiherald, 27 June 2018 The researchers used this tiny deflection to calculate that the mass of Stein 2051B is about 68 percent the mass of our sun — or 1.4 octillion tons (that's 14 followed by 26 zeros). Sarah Kaplan, Washington Post, 13 June 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'octillion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of octillion

1690, in the meaning defined above

History and Etymology for octillion

French, from Middle French, from oct- octa- + -illion (as in million)

Keep scrolling for more

Learn More About octillion

Time Traveler for octillion

Time Traveler

The first known use of octillion was in 1690

See more words from the same year

Dictionary Entries Near octillion




See More Nearby Entries 

Statistics for octillion

Cite this Entry

“Octillion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/octillion. Accessed 1 Aug. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Dog Words Quiz

  • shiba puppy more or less demanding cuddles
  • Which of the following animals has a dog in its etymology?
True or False

Test your knowledge - and maybe learn something along the way.


Anagram puzzles meet word search.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!