noun, often attributive \ˌən-di-ˈsil-yən\

Definition of UNDECILLION

US :  a number equal to 1 followed by 36 zeros — see number table; also British :  a number equal to 1 followed by 66 zeros — see number table


Latin undecim eleven (from unus one + decem ten) + English -illion (as in million) — more at one, ten
First Known Use: 1931


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