trillion

noun

tril·​lion ˈtri(l)-yən How to pronounce trillion (audio)
1
: a number equal to 1,000 times one billion see Table of Numbers
2
: an indeterminately large number
a trillion mosquitoes out tonight
trillion adjective
trillionth adjective or noun

Examples of trillion in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Coral reefs are an essential habitat for marine species, vital for food security, contribute trillions to the global economy and buffer coastal areas from storms. Laura Paddison, CNN Money, 13 Oct. 2025 Government bonds are pledged and repledged as collateral in trillions of dollars worth of transactions every day. Luke Xie, MSNBC Newsweek, 10 Oct. 2025 The gut has trillions of microbial residents, both benefical and harmful. Mitzi Nagarkatti, The Conversation, 10 Oct. 2025 Our stomachs and intestines are home to trillions of bacteria and other microorganisms, with certain types being commonly found throughout the human gut. Mrigakshi Dixit, Interesting Engineering, 9 Oct. 2025 See All Example Sentences for trillion

Word History

Etymology

French, from tri- + -illion (as in million)

First Known Use

1690, in the meaning defined at sense 1

Time Traveler
The first known use of trillion was in 1690

Browse Nearby Words

Cite this Entry

“Trillion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/trillion. Accessed 16 Oct. 2025.

Kids Definition

trillion

noun
tril·​lion ˈtril-yən How to pronounce trillion (audio)
1
: a number equal to 1,000 times one billion see number
2
: a very large number
a trillion mosquitoes out tonight
trillion adjective
trillionth adjective
trillionth noun

More from Merriam-Webster on trillion

Last Updated: - Updated example sentences
Love words? Need even more definitions?

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