billion

noun

bil·​lion ˈbi(l)-yən How to pronounce billion (audio)
1
US : a number equal to 1,000 million see Table of Numbers
also, British : a number equal to 1,000 milliard see Table of Numbers
2
: a very large number
billion adjective
billionth adjective or noun

Did you know?

How much is a billion? It might depend on whom you ask. Billion was borrowed from French in the late 1600s to indicate the number one million raised to the power of two, or a million million—a number represented by a 1 followed by 12 zeros. However, the French later changed their naming conventions so that a billion became a thousand million (a 1 followed by 9 zeros) and a trillion became a thousand thousand million (or a million million, the old billion). The French have since returned to the older system, but it was this new system that was adopted by American English speakers in the 1800s. In Britain, the newer system has seen increasing use since the 1950s, but the older sense is still sometimes used there as well.

Examples of billion in a Sentence

We could see a billion stars in the sky.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Novo and Lilly have invested billions to ramp up supply of their treatments, which lagged demand for most of last year. Bhanvi Satija, Puyaan Singh, USA TODAY, 22 Feb. 2025 Ukraine has tried to resist a total capitulation to American demands on natural resources, but has faced intense pressure from President Trump, who views access to Ukraine’s vast mineral wealth as necessary repayment for the billions the United States has provided Kyiv for its war against Russia. Constant Méheut, New York Times, 22 Feb. 2025 The sheer scale of activity - millions of tokens, billions in volume, and hundreds of millions in fees - suggests that Pump.fun has tapped into a powerful demand for speculative trading. Boaz Sobrado, Forbes, 22 Feb. 2025 Ukrainian officials are also pushing back against the Trump Administration's proposals to take a large chunk of the country's rare earth metals as de facto repayment for the billions of dollars in American military aid. Tom Rogers, Newsweek, 21 Feb. 2025 See All Example Sentences for billion

Word History

Etymology

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

First Known Use

1690, in the meaning defined at sense 1

Time Traveler
The first known use of billion was in 1690

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Cite this Entry

“Billion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/billion. Accessed 3 Mar. 2025.

Kids Definition

billion

noun
bil·​lion ˈbil-yən How to pronounce billion (audio)
1
: a number equal to 1,000 million : 1,000,000,000 see number
2
: a very large number
billion adjective
billionth adjective or noun

More from Merriam-Webster on billion

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