noun, often attributive
vi·​gin·​til·​lion | \ ˌvī-ˌjin-ˈtil-yən How to pronounce vigintillion (audio) \

Definition of vigintillion

US : a number equal to 1 followed by 63 zeros — see Table of Numbers also, British : a number equal to 1 followed by 120 zeros — see Table of Numbers

Examples of vigintillion in a Sentence

Recent Examples on the Web Physics theories suggest that sometime between 10^34 (1 decillion) and 10^64 (1 vigintillion) years from now, the protons found in the nuclei of all atoms will decay. NBC News, 20 Dec. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'vigintillion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of vigintillion

1857, in the meaning defined above

History and Etymology for vigintillion

Latin viginti twenty + English -illion (as in million) — more at vigesimal

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Time Traveler for vigintillion

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The first known use of vigintillion was in 1857

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Cite this Entry

“Vigintillion.” Dictionary, Merriam-Webster, Accessed 25 May. 2022.

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