# quadrilliard
## English
### Etymology

From French quadrilliard, equivalent to quadri- +‎ -illiard.

### Numeral

quadrilliard (plural quadrilliards) (rare)
* A thousand million million million million: 1 followed by twenty-seven zeros, 10$^{27}$.
** 2002 June 19, bruce, “Re: Australians did it again! (?)”, in alt.fan.robert-jordan (Usenet), message-ID <cs9qea.as3.ln@ID-92747.user.dfncis.de>:Ugh. An Australian should use Australian numbers (the same as British), not American. 10^27 is 1,000 quadrillion (or a quadrilliard). An octillion would be 10^48.
** 2003 December 3, arie, “Re: Why Women "Test" Men, and What Men can Do About It”, in alt.support.loneliness (Usenet), message-ID <bqkc2m$dg9$1@news.tudelft.nl>:Your estimation was quite accurate. In a body of 75 kg of water, there are roughly 2.5 x 10^28. That's 25 octillion (US) or 25 quadrilliard (EU).
** 2007, Reinhard Wobst, “Life After DES: New Methods, New Attacks”, in Angelika Shafir, transl., Cryptology Unlocked, John Wiley & Sons, Ltd, →ISBN, section 3 (IDEA: A Special-Class Algoritmh), subsection 5 (Cryptanalyzing IDEA), page 239:There are weak keys in the sense that their use by foisting chosen plaintexts can be proved, which could be interesting for chip cards with a ‘burnt-in key’. First of all, however, these keys can be easily avoided—one only needs to XOR all subkeys with the hexadecimal number 0x0dae—and second, the probability that such a key can be caught is 2$^{−96}$; that is about one out of 10$^{29}$ randomly selected keys (this number even has a name: 100 quadrilliards).
** 2014 May 16, Lela Buckingham, “Chapter 3: Systems of Measurement”, in Fundamental Laboratory Mathematics: Required Calculations for the Medical Laboratory Professional, Philadelphia: F. A. Davis Company, →ISBN, Box 3-3: Terms for Large Numbers, page 47:In the European system, 10$^9$ is a milliard, 10$^{12}$ is a billion, 10$^{15}$ is a billiard, 10$^{18}$ is a trillion, 10$^{21}$ is a trilliard, 10$^{24}$ is a quadrillion, and 10$^{27}$ is a quadrilliard. To avoid confusion in expressing these numbers, the SI prefixes are preferred.

#### Synonyms

* a short scale octillion

#### See also

* Previous: quadrillion. Next: quintillion.

## French
### Etymology

From quadri- (“four”) +‎ -illiard.

### Pronunciation

* IPA: /kwa.dʁi.ljaʁ/, /ka.dʁi.ljaʁ/
* Audio:(file)

### Numeral

quadrilliard m (plural quadrilliards)
* octillion (10$^{27}$)
** 1921, Louis-Gustave Du Pasquier, Le développement de la notion de nombre [The Development of the Notion of Number] (Mémoires de l’Université de Neuchâtel [Memoirs of the University of Neuchâtel]; 3), page 125:fr. 53$^{VI}$ 695 236$^V$ 076 014$^{IV}$ 489 752$^{III}$ 446 593$^{II}$ 034 515$^I$ 466 398,33 / D’après nos propositions, ce nombre s’énoncerait ainsi : 53 sextillions 695 quintilliards 236 quintillions 76 quadrilliards 14 quadrillions 489 trilliards 752 trillions 446 billiards 593 billions 34 milliards 515 millions 466 mille 398 francs et 33 centimes.fr. 53$^{VI}$ 695 236$^V$ 076 014$^{IV}$ 489 752$^{III}$ 446 593$^{II}$ 034 515$^I$ 466 398,33 / According to our proposals, this number would be stated as follows: 53 undecillion 695 decillion 236 nonillion 76 octillion 14 septillion 489 sextillion 752 quintillion 446 quadrillion 593 trillion 34 billion 515 million 466 thousand 398 francs and 33 centimes.
** 2017, Deepak Chopra, Menas Kafatos, translated by Olivier Vinet, Le pouvoir de l’univers est en vous : Partez à la découverte de votre origine cosmique [The Power of the Universe Is within You: Discover Your Cosmic Origin], Guy Trédaniel, →ISBN:Si l’on calcule le nombre total de protons et d’électrons constituant la matière atomique ordinaire, le résultat obtenu est de 1 suivi de 80 zéros, soit 100 trédécillions ! Cela équivaut à 25 quadrilliards [translating million sextillion] (25 x 10$^{27}$) de planètes Terre.If we calculate the total number of protons and electrons that make up ordinary atomic matter, the result is 1 followed by 80 zeros, or 100 quinvigintillion! This is equivalent to 25 octillion (25 x 10$^{27}$) planet Earths.
** 2021, Thomas Andrieu, L’or et l’argent : Guide complet pour comprendre et investir [Gold and Silver: A Complete Guide to Understanding and Investing], JDH Éditions, →ISBN, page 175:À ce moment-là, un forint valait quatre cents quadrilliards pengő […]At that time, one forint was worth four hundred octillion pengős […]