Share this entry
septillion Line breaks: sep¦til|lion
Pronunciation: /sɛpˈtɪljən/

Definition of septillion in English:

cardinal number (plural septillions or (with numeral) same)

1A thousand raised to the eighth power (1024).
Example sentences
  • This is a septillion times longer than the current age of the universe.
  • Translated into arithmetical terms, the result is 79 octillion, 228 septillion, 162 sextillion, 514 quintillion, 270 quadrillion with 15 zeros attached; that is 79,228,162,270,000,000,000,000,000.
  • Naturally occurring wormholes, if they exist at all, are likely to be extremely small, about 10 septillion times smaller than a typical atom.
1.1 dated, chiefly British A million raised to the seventh power (1042).


Late 17th century: from French, from million, by substitution of the prefix septi- 'seven' (from Latin septimus 'seventh') for the initial letters.

Words that rhyme with septillion

billion, jillion, million, bajillion, modillion, multibillion, multimillion, pillion, sextillion, squillion, trillion, zillion
Definition of septillion in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove adverts and access premium resources