septillion

[ sep-til-yuhn ]

noun

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

1. 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

1. amounting to one septillion in number.

septillion

/ sɛpˈtɪljən /

noun

1. (in Britain, France, and Germany) the number represented as one followed by 42 zeros (10 ⁴²)
2. (in the US and Canada) the number represented as one followed by 24 zeros (10 ²⁴) Brit wordquadrillion

Derived Forms

• sepˈtillionth, adjectivenoun

Other Words From

• sep·tillionth noun adjective

Word History and Origins

Origin of septillion¹

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

Word History and Origins

Origin of septillion¹

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

Example Sentences

Our brains are made of more than a septillion molecules, each formed by connected atoms, akin to Lego blocks clicked together.

From Washington Post

All we have to do is find a way to move all 5.972 septillion kilograms of Earth’s mass farther away from our star.

From Scientific American

Meanwhile, the Oxford Dictionary advises that the big number designations which follow quadrillion — quintillion, sextillion, septillion, octillion, nonillion and decillion — are not likely to appear in any financial context too soon.

From Washington Times

By some accounts, there are a septillion stars in the visible universe.

From The New Yorker

No, that term for 1 septillion bytes has nothing to do with the mythical Yeti.

From Forbes