septillion


sep·til·lion

noun, often attributive \sep-ˈtil-yən\

Definition of SEPTILLION

US :  a number equal to 1 followed by 24 zeros — see number table; also British :  a number equal to 1 followed by 42 zeros — see number table

Origin of SEPTILLION

French, from Latin septem + French -illion (as in million) — more at seven
First Known Use: 1690

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