quadrillion

1 of 3

noun (1)

qua·​dril·​lion kwä-ˈdril-yən 

US : a number equal to 1 followed by 15 zeros see Table of Numbers

also, British : a number equal to 1 followed by 24 zeros see Table of Numbers

quadrillion adjective

quadrillionth

kwä-ˈdril-yən(t)th 

adjective or noun

quadrillionth

2 of 3

adjective

qua·​dril·​lionth -n(t)th 

1

: being number one quadrillion in a countable series see Table of Numbers

2

: being one of a quadrillion equal parts into which anything is divisible

quadrillionth

3 of 3

noun (2)

"

plural -s

: one of a quadrillion equal parts of anything

Examples of quadrillion in a Sentence

Recent Examples on the Web

Noun

Goldman Sachs forecasts a 24-fold increase in token consumption by 2030, reaching 120 quadrillion tokens per month, as agentic AI systems replace single-prompt interactions with multi-step tasks that consume orders of magnitude more compute per query. —Rakesh Kumar, Fortune, 30 May 2026

The Large High Altitude Air Shower Observatory (LHAASO) has detected ultra-powerful gamma rays—reaching energies of about one quadrillion electron volts (PeV)—coming from a seemingly ordinary stellar remnant. —Rupendra Brahambhatt, Interesting Engineering, 26 Apr. 2026

That transition occurs at an extraordinarily high frequency, about 2 quadrillion – 2 * 1015 – cycles per second. —Andrei Derevianko, The Conversation, 14 Apr. 2026

Meaningful chemistry simulations beyond the reach of classical computation will require hundreds to thousands of high-quality qubits with error rates of around 10-15, or one error in a quadrillion operations. —Chi Chen, IEEE Spectrum, 2 Mar. 2026

Word History

Etymology

Noun (1)

French, from Middle French, from quadri- + -illion (as in million)

First Known Use

Noun (1)

circa 1690, in the meaning defined above

Rhymes for quadrillion

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

Kids Definition

quadrillion

noun

qua·​dril·​lion kwä-ˈdril-yən 

US : a number equal to 1 followed by 15 zeros see number

also, British : a number equal to 1 followed by 24 zeros see number