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
ˈtri(l)-yən(t)th How to pronounce trillion (audio)
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.
The former Google employee built ChatTJB, a chatbot that looks a lot like the AI assistants Silicon Valley has spent trillions of dollars developing. — Tatiana Sataua, Fortune, 12 Aug. 2026 The human body alone hosts trillions of microorganisms—collectively known as the microbiome—that aid digestion, produce vitamins, help train the immune system, and prevent harmful microbes from becoming established. — Encyclopedia Britannica, 11 Aug. 2026 Companies such as OpenAI, Anthropic, Google, xAI and others are racing toward valuations measured not in billions, but in trillions of dollars. — Sharon K Daniels, Forbes.com, 6 Aug. 2026 Estimates suggest that trillions of dollars will flow to heirs during that time. — Sharon Epperson,stephanie Dhue, CNBC, 6 Aug. 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

Rhymes for trillion

See All Rhymes for trillion

Browse Nearby Words

Trilling
trillion
trillionth
See all Nearby Words

Cite this Entry

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

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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
-yən(t)th How to pronounce trillion (audio)
adjective
trillionth noun

More from Merriam-Webster on trillion

Thesaurus: All synonyms and antonyms for trillion

Nglish: Translation of trillion for Spanish Speakers

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