duodecillion

noun, often attributive

duo·de·cil·lion | \ ˌdü-ō-di-ˈsil-yən

How to pronounce duodecillion (audio)

, ˌdyü-\

Definition of duodecillion

US : a number equal to 1 followed by 39 zeros — see Table of Numbers also, British : a number equal to 1 followed by 72 zeros — see Table of Numbers

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The first known use of duodecillion was in 1844

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