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.
Maduro’s ouster is a blow to that partnership that could leave Chinese banks facing billions in unpaid Venezuelan debt. Simone McCarthy, CNN Money, 31 Jan. 2026 California voters have also approved tens of billions of dollars in borrowing over the last 20 years that the state’s Constitution requires be paid back from the general fund. Lanhee J. Chen, Mercury News, 31 Jan. 2026 Auditors and prosecutors say hospice fraud in Los Angeles is off the charts, with providers scamming billions from taxpayers for patients that don't exist, poor care and no care. William La Jeunesse, FOXNews.com, 30 Jan. 2026 China invested billions in the country’s infrastructure and purchased most of its oil under the Maduro regime. Glenn Taylor, Sourcing Journal, 30 Jan. 2026 See All Example Sentences for billion

Word History

Etymology

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

First Known Use

1801, in the meaning defined at sense 2

Time Traveler
The first known use of billion was in 1801

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Cite this Entry

“Billion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/billion. Accessed 3 Feb. 2026.

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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