octillion

From French octillion.^[1] By surface analysis, oct- (“eight”) +‎ -illion.

• (UK) IPA^(key): /ɒkˈtɪl.iː.ən/

• Audio (General Australian):

  (file)

• Rhymes: -ɪljən
• Hyphenation: oct‧il‧li‧on, oc‧til‧li‧on

octillion (plural octillions)

1. (US, modern British and Australia, short scale) A thousand trillion trillion, a billion billion billion: 1 followed by 27 zeros, 10²⁷.
   • 2019, Bill Bryson, The Body: A Guide for Occupants, Black Swan (2020), pages 5–6:

     Altogether it takes seven billion billion billion (that’s 7,000,000,000,000,000,000,000,000,000, or seven octillion) atoms to make you.

   • 2023 October 9, Dennis Overbye, “The Science Nobel Winners Were Short and Fast”, in The New York Times‎^[1], archived from the original on 12 October 2023:

     We humans are so stuck in the middle of the cosmic scales — in average height, one-hundredth of one-septillionth (10^-24) the size of the observable universe, and with typical life spans of a couple octillion attoseconds. And an attosecond is an eternity compared with the lifetime of the elusive Higgs boson, a subatomic particle that exists for one-thousandth of an attosecond before decaying.

2. (dated British and Australia, long scale) A trillion quintillion: 1 followed by 48 zeros, 10⁴⁸.

• (10²⁷): a long scale quadrilliard
• (10⁴⁸): a short scale quindecillion

• (short and long scale) Previous: septillion. Next: nonillion.

• cotillion

From oct- (“eight”) +‎ -illion.

• IPA^(key): /ɔk.ti.ljɔ̃/

• Audio (France (Toulouse)):

  (file)

• Audio (France (Vosges)):

  (file)

octillion m (plural octillions)

1. quindecillion (10⁴⁸)
2. (dated) octillion (10²⁷)

• “octillion”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012