Definition of vigintillion
US : a number equal to 1 followed by 63 zeros — see number table; also, British : a number equal to 1 followed by 120 zeros — see number table
Indulge Your Inner Word Nerd
Origin and Etymology of vigintillion
Latin viginti twenty + English -illion (as in million) — more at vigesimal
Learn More about vigintillion
Seen and Heard
What made you want to look up vigintillion? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!