Quintillion
//kwɪnˈtɪljən// noun, num, slang
noun, num, slang ·Moderate ·College level
Definitions
Noun
- 1 Any very large number, exceeding normal description. excessive, figuratively, slang
- 2 the number that is represented as a one followed by 18 zeros in the US wordnet
Numeral
- 1 Either of two very large amounts:; A billion billion: 1 followed by eighteen zeros, 10¹⁸. Australian, British, US, modern
"Last week, we used[…]the BBC News website's biggest number: 9,223,372,036,854,775,808, that's 9.2 quintillion[…][the maximum video viewer count on YouTube's] updated counter software."
- 2 Either of two very large amounts:; A million quadrillion: 1 followed by 30 zeros, 10³⁰. Australia, British, dated
- 3 An unspecified very large number. colloquial, excessive
"Near-synonyms: gazillion; see also Thesaurus:zillion"
Example
More examples"Last week, we used[…]the BBC News website's biggest number: 9,223,372,036,854,775,808, that's 9.2 quintillion[…][the maximum video viewer count on YouTube's] updated counter software."
Etymology
From French quintillion. By surface analysis, quint- (“five”) + -illion.
More for "quintillion"
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.