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

Definition of sexdecillion

US : a number equal to 1 followed by 51 zeros — see Table of Numbers also, British : a number equal to 1 followed by 96 zeros — see Table of Numbers

First Known Use of sexdecillion

1848, in the meaning defined above

History and Etymology for sexdecillion

Latin sedecim, sexdecim sixteen (from sex six + decem ten) + English -illion (as in million) — more at ten

Keep scrolling for more

Learn More about sexdecillion

Statistics for sexdecillion

Look-up Popularity

Time Traveler for sexdecillion

The first known use of sexdecillion was in 1848

See more words from the same year

More from Merriam-Webster on sexdecillion

Rhyming Dictionary: Words that rhyme with sexdecillion

Comments on sexdecillion

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


likely to have or produce good results

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Dictionary Devil

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!