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.
Despite the cuts, the nonpartisan Congressional Budget Office estimates the bill would add so much money to the debt that Congress may be forced to execute cuts across the board, including hundreds of billions to Medicare, in a process known as sequestration. Michael Wilner, Los Angeles Times, 29 May 2025 The administration has accused Harvard of being in the grip of a leftist ideology that is damaging the institution, and has withheld billions of dollars in federal funding from the college, with a threat to go further. Jordan King shane Croucher, MSNBC Newsweek, 29 May 2025 Compared to the tens of billions spent on satellite navigation, the Fully Autonomous Flight 2.0 Challenge is a low-cost, short-term project. David Hambling, Forbes.com, 29 May 2025 Huang said recently that years of U.S. restrictions on AI chip exports were a strategic misfire that cost Nvidia billions and handed Chinese rivals a powerful incentive to innovate. Shannon Carroll, Quartz, 28 May 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 4 Jun. 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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