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.
Global income losses during the 1982-1983 and 1997-1998 El Niños were estimated in the trillions of dollars. Dinah Voyles Pulver, USA Today, 25 June 2026 The world’s first trillionaire, Elon Musk, has predicted that trillions of dollars will be spent on antimatter propulsion in the future as humanity attempts to travel to other star systems. Ameya Paleja, Interesting Engineering, 23 June 2026 Still, some analysts voiced caution about the outlook for the AI sector, which has garnered trillions of dollars of investment but has yet to deliver profits on a similar scale. Max Zahn, ABC News, 23 June 2026 Your gut contains trillions (yes, trillions) of bacteria. Laura Solla, Vogue, 23 June 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 26 Jun. 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

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