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quadrillion

Flag: gbEnglishOxford Dictionary of English
quadrillion /kwɒˈdrɪljən /
▸ cardinal number
(plural quadrillions or (with numeral) plural quadrillion)
a thousand raised to the power of five (1015).
▪ dated mainly British English a thousand raised to the power of eight (1024).
– DERIVATIVES
quadrillionth ordinal number
– ORIGIN late 17th century: from French, from million, by substitution of the prefix quadri- ‘four’ for the initial letters.