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

Modeling plasma behavior at those conditions involves solving equations across multiple dimensions and charge states, representing trillions of mathematical particles. —Neetika Walter, Interesting Engineering, 4 Mar. 2026

While transitioning to autonomous vehicles will require trillions of dollars in infrastructure and take many years, deploying large-language model chatbots is cheap, easy, and happening right now. —Nick Lichtenberg, Fortune, 3 Mar. 2026

Africa’s population is young and increasingly urban, with a consumer market projected in the trillions and business demand expected to exceed $4 trillion by 2030, according to research from the Brookings Institution. —Maurizio Caio, semafor.com, 2 Mar. 2026

For decades, our politicians spent trillions and trillions of dollars rebuilding foreign nations, fighting foreign wars, and defending foreign borders. —ABC News, 1 Mar. 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