noun, often attributive
de·​cil·​lion | \ di-ˈsil-yən How to pronounce decillion (audio) \

Definition of decillion

US : a number equal to 1 followed by 33 zeros — see Table of Numbers also, British : a number equal to 1 followed by 60 zeros — see Table of Numbers

Examples of decillion in a Sentence

Recent Examples on the Web

The scientists found that a proton’s building block, known as a quark, faces a pressure of 100 decillion Pascal near the center of a proton. David Grossman, Popular Mechanics, "Pressures Inside a Proton Are More Extreme Than Inside a Neutron Star," 17 May 2018 Physics theories suggest that sometime between 10^34 (1 decillion) and 10^64 (1 vigintillion) years from now, the protons found in the nuclei of all atoms will decay. NBC News, "How humans might outlive Earth, the sun...and even the universe," 20 Dec. 2017

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

First Known Use of decillion

1844, in the meaning defined above

History and Etymology for decillion

Latin decem + English -illion (as in million)

Keep scrolling for more

Learn More about decillion

Statistics for decillion

Look-up Popularity

Time Traveler for decillion

The first known use of decillion was in 1844

See more words from the same year

More from Merriam-Webster on decillion

Rhyming Dictionary: Words that rhyme with decillion

Comments on decillion

What made you want to look up decillion? Please tell us where you read or heard it (including the quote, if possible).


to complain fretfully

Get Word of the Day daily email!

Test Your Vocabulary

What's that Smell?! Quiz

  • wide eyed dog smelling rose
  • Someone who is hircine smells like a:
True or False

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


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

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