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
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Saharan dust is an extremely dry, dusty air mass, containing about 50% less moisture than the typical tropical atmosphere, the National Hurricane Center notes. Howard Cohen, Miami Herald, 30 May 2025 Spring is a transition time when the cold and dry air mass from the Arctic, which dominates the region in winter, is gradually being pushed away by warm and moist air from the Gulf that dominates the region in summer. Shuang-Ye Wu, The Conversation, 8 Apr. 2025 Additionally, the winds will not be too strong over the next few days as gusts will stay below 30 mph, but even a slight wind in an air mass this cold will add a nasty bite, according to CBS News. Raul A. Reyes, Newsweek, 23 Jan. 2025 Winds chills down between -20°F to -35°F can be expected area wide under this arctic air mass. Kristen Waggoner, Newsweek, 22 Jan. 2025 See All Example Sentences for air mass

Word History

First Known Use

1882, in the meaning defined above

Time Traveler
The first known use of air mass was in 1882

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Cite this Entry

“Air mass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/air%20mass. Accessed 10 Jun. 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

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