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.
When Austin and Phoenix cleared the way for semiconductor expansion, billions in private investment followed. Ethan Karp, Forbes.com, 10 June 2025 Colombia’s army is the largest and most professional in Latin America, the recipient of billions dollars in aid from the United States. Kate Linthicum, Los Angeles Times, 9 June 2025 And the President’s feckless tech bros can arbitrarily withhold billions in federal support for everything from cancer research to hurricane tracking. Ron Cunningham, The Orlando Sentinel, 8 June 2025 The Department of Government Efficiency (DOGE) has also enacted cost-cutting measures projected to save taxpayers billions over the next decade through procurement reforms and more efficient contracting. Christopher Anderson, Baltimore Sun, 7 June 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

Browse Nearby Words

Podcast

Cite this Entry

“Billion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/billion. Accessed 13 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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!