septillion

[ sep-til-yuh n ]
/ sɛpˈtɪl yən /

noun, plural sep·til·lions, (as after a numeral) sep·til·lion.

a cardinal number represented in the U.S. by 1 followed by 24 zeros, and in Great Britain by 1 followed by 42 zeros.

adjective

amounting to one septillion in number.

Origin of septillion

1680–90; < French, equivalent to sept seven + -illion, as in million

OTHER WORDS FROM septillion

sep·til·lionth, noun, adjective

Words nearby septillion

septicidal, septico-, septicopyemia, septifragal, septilateral, septillion, septimal, septimana, septime, septimus, septisyllable

British Dictionary definitions for septillion

septillion
/ (sɛpˈtɪljən) /

noun plural -lions or -lion

(in Britain, France, and Germany) the number represented as one followed by 42 zeros (10 42)
(in the US and Canada) the number represented as one followed by 24 zeros (10 24) Brit word: quadrillion

Derived forms of septillion

septillionth, adjective, noun

Word Origin for septillion

C17: from French, from sept seven + -illion, on the model of million