Septillion Definition

sĕp-tĭlyən
noun
The cardinal number equal to 1024 .
American Heritage
The number represented by 1 followed by 24 zeros.
Webster's New World
The number represented by 1 followed by 42 zeros.
Webster's New World
The cardinal number equal to 1042 .
American Heritage
adjective
Amounting to one septillion in number.
Webster's New World

Other Word Forms of Septillion

Noun

Singular:
septillion
Plural:
septillions

Origin of Septillion

  • French Latin septem seven septet French -illion (as in million million) (from Old French milion million)

    From American Heritage Dictionary of the English Language, 5th Edition

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