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

Corning is expanding the facility to accommodate growing demand from Meta and other big spenders like Nvidia, OpenAI, Google, Amazon and Microsoft as part of an extended industry buildout that's reaching into the trillions of dollars. —Katie Tarasov, CNBC, 27 Jan. 2026

Cedar fever season begins in December when nearly 9 million acres of Ashe juniper, aka mountain cedar, predominantly in the Texas Hill Country, start releasing trillions of pollen that blows northward into North Texas. —Matt Leclercq, Fort Worth Star-Telegram, 26 Jan. 2026

Yet the trillions of dollars flowing into AI show the business world isn’t waiting to find out. —Jeremy Kahn, Fortune, 23 Jan. 2026

Big technology companies are poised to spend trillions of dollars on the infrastructure needed to power AI models. —Ellen Dimauro, Bloomberg, 22 Jan. 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