quintillion
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quin·til·lion

noun \kwin-ˈtil-yən\

Definition of QUINTILLION

US : a number equal to 1 followed by 18 zeros — see number table; also British : a number equal to 1 followed by 30 zeros — see number table
quintillion adjective
quin·til·lionth \-yən(t)th\ adjective or noun

Origin of QUINTILLION

Latin quintus + English -illion (as in million)
First Known Use: 1674

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