Definition of sextillion in English:


cardinal number

  • 1A thousand raised to the seventh power (10²¹)

    • ‘The figure - 7 followed by 22 zeros or, more accurately, 70 sextillion - was calculated by a team of stargazers based at the Australian National University.’
    • ‘Translated into arithmetical terms, the result is 79 octillion, 228 septillion, 162 sextillion, 514 quintillion, 270 quadrillion with 15 zeros attached; that is 79, 228, 162, 270,000,000,000,000,000.’
    • ‘In the last decades of the 20c, however, the North American use has become universal, providing the set million, billion, trillion, quadrillion, quintillion, sextillion, septillion, octillion, nonillion, decillion.’
    • ‘And a mouse is miracle enough to stagger sextillions of infidels.’
    • ‘A further challenge is the humbling fact that the original cloud is billions of times wider and a hundred sextillion (100 x [10.sup.21]) times less dense than the star the models are trying to simulate.’
    1. 1.1British dated A million raised to the sixth power (10³⁶)


Late 17th century: from French, from million, by substitution of the prefix sexti- ‘six’ (from Latin sextus ‘sixth’) for the initial letters.