duo·​de·​cil·​lion ˌdü-ō-di-ˈsil-yən How to pronounce duodecillion (audio)
often attributive
US : a number equal to 1 followed by 39 zeros see Table of Numbers
also, British : a number equal to 1 followed by 72 zeros see Table of Numbers

Word History


Latin duodecim twelve + English -illion (as in million)

First Known Use

1844, in the meaning defined above

Time Traveler
The first known use of duodecillion was in 1844

Dictionary Entries Near duodecillion

Cite this Entry

“Duodecillion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/duodecillion. Accessed 21 Feb. 2024.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!