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air mass
noun
: a body of air extending hundreds or thousands of miles horizontally and sometimes as high as the stratosphere and maintaining as it travels nearly uniform conditions of temperature and humidity at any given level
Examples of air mass in a Sentence
Recent Examples on the Web
The bitterly cold air mass is affecting the western, central and eastern United States this week, causing temperatures to plunge far below normal for January.
—Nazaneen Ghaffar, New York Times, 20 Jan. 2025
Originating in Siberia, a bitter cold air mass will likely produce dangerous wind chills across portions of the Southeast and send temperatures below freezing as far south as the Gulf Coast and Florida.
—Alexis Simendinger, The Hill, 3 Jan. 2025
The warm forecast for Sunday afternoon though Monday will be hit again with a much drier and colder air mass moving behind a front Monday night.
—Richard Tribou, Orlando Sentinel, 2 Jan. 2025
The longer the fetch, the more time the cold, dry air mass has to suck up warm water along the way.
—Caitlin Looby, Journal Sentinel, 2 Dec. 2024
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Word History
First Known Use
1882, in the meaning defined above
Dictionary Entries Near air mass
Cite this Entry
“Air mass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/air%20mass. Accessed 30 Jan. 2025.
Kids Definition
air mass
noun
: a body of air extending hundreds or thousands of miles sideways and sometimes as high as the stratosphere and having nearly the same conditions of temperature and humidity at any single level
More from Merriam-Webster on air mass
Britannica.com: Encyclopedia article about air mass
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