septillion

noun, often attributive sep·til·lion \ sep-ˈtil-yən \

Definition of septillion

US : a number equal to 1 followed by 24 zeros — see Table of Numbers; alsoBritish : a number equal to 1 followed by 42 zeros — see Table of Numbers

Origin and Etymology of septillion

French, from Latin septem + French -illion (as in million) — more at seven


Learn More about septillion


Seen and Heard

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

Love words? Need even more definitions?

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

WORD OF THE DAY

sticky or viscid

Get Word of the Day daily email!

Test Your Vocabulary

Find the Cousins

  • a-large-tree-with-many-branches
  • Which pair shares a common word ancestor?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ

Love words? Need even more definitions?

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