septillion

sep·til·lion
S1E1P3T1I1L1L1I1O1N1
/sɛpˈtɪljən/

numeral

A trillion trillion: 1 followed by 24 zeros, 10²⁴.

Similar
10241042
OriginFrench septillion →
Scrabble 12
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Meanings

numeralseptillion (plural septillions)

plural septillions

  1. USmodern British & Australian; short scale; modern British & Australian; short scaleA trillion trillion: 1 followed by 24 zeros, 10²⁴.
  2. dated British & Australian; long scale; dated British & Australian; long scaleA billion quintillion: 1 followed by 42 zeros, 10⁴².

Synonyms & antonyms

a long scale quadrillion

Similar
1024

a short scale tredecillion

Similar
1042
Also see
heptillion

Origin

  1. Frenchseptillion
  2. Englishseptillion

From French septillion, from sept- (“seven”) + -illion. By surface analysis, sept- + -illion.

More words from French

Full word history & related roots →

Translations

Catalan quadrilió
  • quadrilióa trillion trillion, 1024 — see also quadrillion
Esperanto kvariliono, sepiliono
  • kvarilionoa trillion trillion, 1024 — see also quadrillion
  • sepilionoa billion quintillion, 1042 — see also tredecillion
Finnish kvadriljoona, septiljoona
  • kvadriljoonaa trillion trillion, 1024 — see also quadrillion
  • septiljoonaa billion quintillion, 1042 — see also tredecillion
French quatrillion
  • quatrilliona trillion trillion, 1024 — see also quadrillion
German Quadrillion, Septillion
  • Quadrilliona trillion trillion, 1024 — see also quadrillion
  • Septilliona billion quintillion, 1042 — see also tredecillion
Hungarian kvadrillió
  • kvadrillióa trillion trillion, 1024 — see also quadrillion
Icelandic kvaðrilljón
  • kvaðrilljóna trillion trillion, 1024 — see also quadrillion
Italian quattrilione, settilione
  • quattrilionea trillion trillion, 1024 — see also quadrillion
  • settilionea billion quintillion, 1042 — see also tredecillion
Japanese 一秭, 百正
  • 一秭 (ichijo/isshi)a trillion trillion, 1024 — see also quadrillion
  • 百正 (hyaku-sei)a billion quintillion, 1042 — see also tredecillion
Malay septilion
  • septiliona trillion trillion, 1024 — see also quadrillion
Polish kwadrylion
  • kwadryliona trillion trillion, 1024 — see also quadrillion
Portuguese quatrilião, quadrilião
  • quatriliãoa trillion trillion, 1024 — see also quadrillion
  • quadriliãoa trillion trillion, 1024 — see also quadrillion
  • septilhãoa trillion trillion, 1024 — see also quadrillion
  • septiliãoa billion quintillion, 1042 — see also tredecillion
Russian септиллио́н
  • септиллио́н (septillión)a trillion trillion, 1024 — see also quadrillion
Spanish cuatrillón, septillón
  • cuatrillóna trillion trillion, 1024 — see also quadrillion
  • septillóna trillion trillion, 1024 — see also quadrillion
  • septillóna billion quintillion, 1042 — see also tredecillion
Swedish kvadriljon, septiljon
  • kvadriljona trillion trillion, 1024 — see also quadrillion
  • septiljona billion quintillion, 1042 — see also tredecillion
Welsh septiliwn
  • septiliwna trillion trillion, 1024 — see also quadrillion

Rhymes & wordplay

Rhymes with septillion

millionbillionBrazilianpaviliontrilliongillianzillionvermilionJillianabelianMaximilianCastiliangazillionquadrillionpillionquintillionjillioncentilliondecillionduodecillionduotrigintillionduovigintilliongilliongodzillion
All rhymes →
Cite this entry
APA

septillion. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/septillion

MLA

“septillion.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/septillion. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “septillion,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/septillion.

Source: septillion on Wiktionary, CC BY-SA 4.0.