noun, plural undecillions (as after a numeral) undecillion.
a cardinal number represented in the U.S. by 1 followed by 36 zeros, and in Great Britain by 1 followed by 66 zeros.
amounting to one undecillion in number.

1930–35; < Latin undec(im) eleven (ūn(us) one + -decim, combining form of decem ten) + -illion, as in million

undecillionth, adjective, noun
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