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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
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
The downturn couldn’t have come at a worse time, considering that moviegoers are showing signs of life in terms of returning to the cinema in mass numbers.
—Pamela McClintock, The Hollywood Reporter, 15 Dec. 2023
People lost jobs in mass numbers in early 2020, and the government tried to soften the blow with multiple relief packages.
—Ben Casselman, New York Times, 19 Oct. 2023
Tom Cruise Is Doing an 'Oppenheimer' and 'Barbie' Double Feature Too: 'Doesn't Get More Explosive'
Murphy’s excitement over the two films has mirrored that of fans, as there has been a mass number of bookings to see Oppenheimer and Barbie as a double feature in theaters.
—Escher Walcott, Peoplemag, 12 July 2023
Mass customization is all about creating a mass number of products that are all different, tailored specifically for each individual customer.
—John Clemons, Forbes, 21 Apr. 2022
The Wisconsin Department of Agriculture, Trade and Consumer Protection is reminding consumers of their right to a refund given the mass number of cancellations because of COVID-19.
—Hope Karnopp, Milwaukee Journal Sentinel, 11 Aug. 2021
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'mass number.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Word History
First Known Use
1923, in the meaning defined above
Dictionary Entries Near mass number
Cite this Entry
“Mass number.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mass%20number. Accessed 5 Nov. 2024.
Kids Definition
mass number
noun
: a whole number that expresses the approximate mass of an atom in terms of the number of protons and neutrons in the atom
Medical Definition
mass number
noun
: an integer that approximates the mass of an isotope and that designates the number of nucleons in the nucleus
the symbol for carbon of mass number 14 is 14C or C14
compare atomic mass
More from Merriam-Webster on mass number
Britannica.com: Encyclopedia article about mass number
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