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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 cold air mass is shallow, with an inversion height around 7000' msl.
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Anders Fogh Rasmussen, Newsweek, 4 Feb. 2025
Garcia said the instability has been caused as the warmer air mass moves across the region trailed over the ocean by a colder one moving in to replace it.
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Rick Hurd, The Mercury News, 4 Feb. 2025
In the United States this past week, the bitter arctic air mass plunged much of the country into dangerously cold conditions, delivering record-breaking low temperatures not experienced in decades, and life-threatening wind chills.
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Nazaneen Ghaffar, New York Times, 23 Jan. 2025
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.
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Nazaneen Ghaffar, New York Times, 20 Jan. 2025
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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 17 Feb. 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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