noun, often attributive
no·​nil·​lion | \ nō-ˈnil-yən How to pronounce nonillion (audio) \

Definition of nonillion

US : a number equal to 1 followed by 30 zeros — see Table of Numbers also, British : a number equal to 1 followed by 54 zeros — see Table of Numbers

Examples of nonillion in a Sentence

Recent Examples on the Web

Its explosiveness likely had about a nonillion times (10 with 30 zeroes after it) the power of a hydrogen bomb, the researchers estimate—that is about five to 10 times more energetic than previously thought. Rachel Crowell, Scientific American, "The Universe’s First Stars Exploded in Strange Ways," 31 May 2019

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

First Known Use of nonillion

1690, in the meaning defined above

History and Etymology for nonillion

French, from Latin nonus ninth + French -illion (as in million) — more at noon

Keep scrolling for more

Learn More about nonillion

Statistics for nonillion

Last Updated

13 Jul 2019

Look-up Popularity

Time Traveler for nonillion

The first known use of nonillion was in 1690

See more words from the same year

More from Merriam-Webster on nonillion

Rhyming Dictionary: Words that rhyme with nonillion

Comments on nonillion

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


a wrong name or inappropriate designation

Get Word of the Day daily email!

Test Your Vocabulary

Summer 2019 Words of the Day Quiz

  • a-bowl-of-peach-sorbet-with-cut-peaches-next-to-it
  • Which is a synonym of desideratum?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Word Winder's CrossWinder

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!