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

If trillions in traditional assets migrate on-chain, exchanges like Gemini stand to be among the biggest winners. —Marie Poteriaieva, Forbes.com, 9 Sep. 2025

Everyone has trillions of gut bacteria living in their intestines. —Courtney Southwick, Health, 8 Sep. 2025

In addition, the Congressional Budget Office has estimated that tariffs would shave trillions of dollars off the federal budget deficit. —Jason Ma, Fortune, 7 Sep. 2025

What starts as millions morphs into billions, and billions morph into trillions. —Les Rubin, Boston Herald, 7 Sep. 2025

Word History

Etymology

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

First Known Use

1690, in the meaning defined at sense 1

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