trillion

noun

tril·​lion ˈtri(l)-yən How to pronounce trillion (audio)
Synonyms of trillionnext
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.
There are trillions of bacteria and other microorganisms in the gastrointestinal tract, some of which can be helpful and others harmful. Rena Goldman, Health, 17 Feb. 2026 That’s easily hundreds of billions, or even trillions in value, up in the air. Allie Garfinkle, Fortune, 13 Feb. 2026 The stellar remnant will contract to form a white dwarf, and while the planetary nebula will fade after perhaps 20,000 years, the white dwarf will continue to shine for many trillions of years before fading out. Big Think, 11 Feb. 2026 China doubled down with trillions in cumulative investment to build a clean-tech manufacturing base and invest in green infrastructure. Justin Worland, Time, 10 Feb. 2026 See All Example Sentences for trillion

Word History

Etymology

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

First Known Use

1745, in the meaning defined at sense 2

Time Traveler
The first known use of trillion was in 1745

Browse Nearby Words

Cite this Entry

“Trillion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/trillion. Accessed 19 Feb. 2026.

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

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