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
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In other words, the plan would require individuals making more than $184,500 per year to pay taxes on the entirety of their income, potentially generating trillions in additional funds for the program over the next 10 years. Max Zahn, ABC News, 2 July 2026 Here is what to know about the trillions of bacteria in your mouth and why researchers now treat them as a full-body health signal. Allison Palmer, Sacbee.com, 2 July 2026 The money funds four new fabrication plants, two from each company, plus an 81 trillion won chip-packaging cluster near Seoul and tens of trillions more from local governments. Jon Markman, Forbes.com, 30 June 2026 Fibre can also be a prebiotic, feeding the trillions of gastrointestinal bacteria that support our immune and nervous systems. Hannah Goldfield, New Yorker, 29 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 5 Jul. 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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