Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW
: a number equal to 1 followed by 42 zeros — see Table of Numbers
: a number equal to 1 followed by 78 zeros — see Table of Numbers
1850, in the meaning defined above
Latin tredecim thirteen (from tres three + decem ten) + English -illion (as in million) — more at three, ten
Keep scrolling for more
Resources for tredecillion
Time Traveler for tredecillion
See more words from the same year
More from Merriam-Webster on tredecillion
Rhyming Dictionary: Words that rhyme with tredecillion
Comments on tredecillion
What made you want to look up tredecillion? Please tell us where you read or heard it (including the quote, if possible).
amusing and light sparring with words
Get Word of the Day daily email!
Late Autumn 2018 Words of the Day Quiz
Can you spell these 10 commonly misspelled words?
Test Your Knowledge - and learn some interesting things along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Wordies read on for enlightenment.
We hold back nothing in this article.
Words from the week of 12/7/2018
What is 'snuff' and how high up is it?
And is one way more correct than the others?
The story of an imaginary word that managed to sneak past our editors and enter the dictionary.
How to use a word that (literally) drives some people nuts.
The awkward case of 'his or her'
More word puzzles to rack your brain
A game of winding words.