[sep-ten-di-sil-yuh n]

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.

Origin of septendecillion

1935–40; < Latin septendec(im) seventeen + -illion, as in million
Related formssep·ten·de·cil·lionth, adjective, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019