octillion
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oc·til·lion

noun \äk-ˈtil-yən\

Definition of OCTILLION

US : a number equal to 1 followed by 27 zeros — see number table; also British : a number equal to 1 followed by 48 zeros — see number table

Origin of OCTILLION

French, from Middle French, from oct- octa- + -illion (as in million)
First Known Use: 1690

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