mass number
noun
: an integer that approximates the mass of an isotope and designates the number of nucleons in the nucleus
Examples of mass number in a Sentence
Recent Examples on the Web
Immigration and Customs Enforcement agents are going to workplaces, homeless shelters and even immigration reporting centers and indiscriminately rounding up mass numbers of migrants.
—
Chicago Tribune, 18 June 2025
The preference for boys was a bias that killed in mass numbers.
—Bryan Walsh, Vox, 7 Dec. 2018
Those are the people who are really getting targeted now in mass numbers.
—Suzanne Gamboa, NBC news, 30 May 2025
President-elect Donald Trump has promised to expel mass numbers of them his first day in office.
—Whitney Eulich, The Christian Science Monitor, 15 Jan. 2025
This local boutique made waves when the shop drew Swifties in mass numbers during Taylor Swift's three-day stop in Indianapolis earlier this month.
—Alysa Guffey, The Indianapolis Star, 27 Nov. 2024
The plan would eliminate tens of thousands of federal jobs, the Department of Education would be abolished, and undocumented immigrants would be deported in mass numbers, among other policies.
—Melissa Noel, Essence, 9 Sep. 2024
According to the project, tens of thousands of federal jobs would be eliminated, the Department of Education would be abolished, and undocumented immigrants would be deported in mass numbers, among other policies.
—Kizzy Cox, Essence, 12 July 2024
Davis spent years programming bots to attack e-commerce sites to buy up mass numbers of limited-edition athletic shoes.
—Ash-Har Quraishi, CBS News, 8 Feb. 2024
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Chicago Tribune, 18 June 2025
The preference for boys was a bias that killed in mass numbers.
—Bryan Walsh, Vox, 7 Dec. 2018
Those are the people who are really getting targeted now in mass numbers.
—Suzanne Gamboa, NBC news, 30 May 2025
President-elect Donald Trump has promised to expel mass numbers of them his first day in office.
—Whitney Eulich, The Christian Science Monitor, 15 Jan. 2025
This local boutique made waves when the shop drew Swifties in mass numbers during Taylor Swift's three-day stop in Indianapolis earlier this month.
—Alysa Guffey, The Indianapolis Star, 27 Nov. 2024
The plan would eliminate tens of thousands of federal jobs, the Department of Education would be abolished, and undocumented immigrants would be deported in mass numbers, among other policies.
—Melissa Noel, Essence, 9 Sep. 2024
According to the project, tens of thousands of federal jobs would be eliminated, the Department of Education would be abolished, and undocumented immigrants would be deported in mass numbers, among other policies.
—Kizzy Cox, Essence, 12 July 2024
Davis spent years programming bots to attack e-commerce sites to buy up mass numbers of limited-edition athletic shoes.
—Ash-Har Quraishi, CBS News, 8 Feb. 2024
Cite this Entry
“Mass number.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mass%20number. Accessed 1 Jul. 2025.
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