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duo·de·cil·lion | \ ˌdü-ō-di-ˈsil-yən 
, ˌdyü- \
, 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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Time Traveler for duodecillion
The first known use of duodecillion was in 1844
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