sextillion
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sex·til·lion

noun, often attributive \seks-ˈtil-yən\

Definition of SEXTILLION

US : a number equal to 1 followed by 21 zeros — see number table; also British : a number equal to 1 followed by 36 zeros — see number table

Origin of SEXTILLION

French, irregular from sex- (from Latin sex) + -illion (as in million)
First Known Use: 1690

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