[ sep-ten-di-sil-yuh n ]
/ ˌsɛp tɛn dɪˈsɪl yən /

noun, plural sep·ten·de·cil·lions, (as after a numeral) sep·ten·de·cil·lion.

a cardinal number represented in the U.S. by 1 followed by 54 zeros, and in Great Britain by 1 followed by 102 zeros.


amounting to one septendecillion in number.


Discover The Influence Of Portuguese On English Via This Quiz!
We’ve gathered some interesting words donated to English from Portuguese … as well as some that just don’t translate at all. Do you know what they mean?
Question 1 of 11
Which of the following animal names traces its immediate origin to Portuguese?

Origin of septendecillion

1935–40; < Latin septendec(im) seventeen + -illion, as in million

OTHER WORDS FROM septendecillion

sep·ten·de·cil·lionth, adjective, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020