Standard Lemma guide

octillion

num · 3 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • UK: /ɒkˈtɪl.iː.ən/
  • Australia: Recorded audio is listed in the source snapshot.
  • rhymes with -ɪljən
  • CMU ARPABET: AA0 K T IH1 L Y AH0 N Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

num

Meaning 1

A thousand trillion trillion, a billion billion billion: 1 followed by 27 zeros, 1027.

Definition source: English Wiktionary via Wiktextract

Usage: Australia, UK, US, modern

Qualifier: short scale

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

num

Meaning 2

A trillion quintillion: 1 followed by 48 zeros, 1048.

Definition source: English Wiktionary via Wiktextract

Usage: Australia, UK, dated

Qualifier: long scale

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

the number that is represented as a one followed by 27 zeros

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: large integer

History

Etymology

From French octillion. By surface analysis, oct- (“eight”) + -illion.

Across languages

Translations

27 source translations are retained for this English entry.

  • Armenian: հազար քառիլիոն (hazar kʻaṙilion) — a thousand trillion trillion, 10
  • Esperanto: kvariliardo — a thousand trillion trillion, 10
  • Finnish: kvadriljardi — a thousand trillion trillion, 10
  • French: quadrilliard — a thousand trillion trillion, 10
  • German: Quadrilliarde — a thousand trillion trillion, 10
  • Hungarian: kvadrilliárd — a thousand trillion trillion, 10
  • Icelandic: kvaðrilljarður — a thousand trillion trillion, 10
  • Italian: quatriliardo — a thousand trillion trillion, 10
  • Japanese: 千秭 — a thousand trillion trillion, 10
  • Malay: oktilion — a thousand trillion trillion, 10
  • Maltese: ottiljun — a thousand trillion trillion, 10
  • Maltese: kwadriljard — a thousand trillion trillion, 10
  • Polish: kwadryliard — a thousand trillion trillion, 10
  • Portuguese: octilhão — a thousand trillion trillion, 10
  • Russian: октиллион (oktillion) — a thousand trillion trillion, 10
  • Spanish: mil cuatrillones — a thousand trillion trillion, 10
  • Spanish: octillón — a thousand trillion trillion, 10
  • Turkish: oktilyon — a thousand trillion trillion, 10
  • Ukrainian: октильйон (oktylʹjon) — a thousand trillion trillion, 10
  • Welsh: octiliwn — a thousand trillion trillion, 10
  • Chinese Mandarin: 一極 /一极 — a trillion quintillion, 1048 — see also quindecillion
  • Esperanto: okiliono — a trillion quintillion, 1048 — see also quindecillion
  • Finnish: oktiljoona — a trillion quintillion, 1048 — see also quindecillion
  • French: octillion — a trillion quintillion, 1048 — see also quindecillion
  • German: Oktillion — a trillion quintillion, 1048 — see also quindecillion
  • Russian: квиндециллион (kvindecillion) — a trillion quintillion, 1048 — see also quindecillion
  • Spanish: octillón — a trillion quintillion, 1048 — see also quindecillion