trillion

noun

tril·​lion ˈtri(l)-yən 

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 

adjective or noun

Examples of trillion in a Sentence

Recent Examples on the Web

At stake is not just some meetings, but a questioning of the kingdom’s pitch as a safe home for trillions in financial assets, data centers, and new industries. — Mohammed Sergie, semafor.com, 10 Oct. 2026

And those rules sit atop the same comprehensive system of federal enforcement that protects trillions of dollars of transactions in US markets. — Ryan Morik Outkick, FOXNews.com, 8 Oct. 2026

The center, for better or worse, of the artificial intelligence and tech industries, worth unimaginable trillions in the form of capital investments at Nvidia, OpenAI, Anthropic, Alphabet, Apple and others. — Daniel Hernandez, Los Angeles Times, 7 Oct. 2026

The rates were used to set the interest rates on trillions of dollars of financial products around the world. — ABC News, 7 Oct. 2026

Word History

Etymology

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

First Known Use

1745, in the meaning defined at sense 2

Rhymes for trillion

• billion
• million
• pillion
• castilian
• civilian
• cotillion
• pavilion
• postilion
• quadrillion
• reptilian
• vermilion
• vermillion

Kids Definition

trillion

noun

tril·​lion ˈtril-yən 

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 

adjective

trillionth noun