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

The seasoning period exists so that a newly public stock’s price has time to settle before trillions of dollars of regular people’s money are pegged to it, because IPOs are often volatile. —Eva Roytburg, Fortune, 2 June 2026

Nvidia's data center business will likely remain its largest opportunity, considering the projections for trillions of dollars in annual AI infrastructure spending. —Zev Fima, CNBC, 1 June 2026

Over the next two decades, trillions of dollars will change hands as Baby Boomers pass assets to younger generations through inheritance, gifts and business transitions. —Melissa Houston, Forbes.com, 1 June 2026

The economy encompasses millions of consumers, large and small businesses as well as the government, which even after DOGE, spends trillions of dollars annually. —Jill Schlesinger, Mercury News, 1 June 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