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.
Both those songs have stream counts in the multiple billions, so perhaps this one will also prove to be catnip on DSPs. Andrew Unterberger, Billboard, 10 Oct. 2025 Although Mexico has recently replaced China as the top source of foreign goods shipped to the United States, America depends on China for hundreds of billions of dollars’ worth of goods. Elisabeth Buchwald, CNN Money, 10 Oct. 2025 The president's latest threats are disrupting, at least briefly, what had been a sustained rally in tech, built on hundreds of billions of dollars in planned spending on artificial intelligence infrastructure. Ari Levy,jordan Novet, CNBC, 10 Oct. 2025 The White House has also said its decision to freeze transportation funding in Chicago and New York and cancel billions of dollars in Biden-era energy project grants are a continuation of their push to shrink the size and scope of the federal bureaucracy. NPR, 10 Oct. 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 13 Oct. 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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