[ uhn-di-sil-yuhn ]

noun,plural un·de·cil·lions, (as after a numeral) un·de·cil·lion.
  1. a cardinal number represented in the U.S. by 1 followed by 36 zeros, and in Great Britain by 1 followed by 66 zeros.

  1. amounting to one undecillion in number.

Origin of undecillion

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

Other words from undecillion

  • un·de·cil·lionth, adjective, noun

Words Nearby undecillion

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use undecillion in a sentence

  • "An undecillion is ten raised to the 36th power," Freddy sighed, fearing that he wasn't getting through to Willy.

    Master of None | Lloyd Neil Goble