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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Despite the sunshine on Monday, don’t expect any change in the frigid air mass over Texas. Mary Wasson, Austin American Statesman, 26 Jan. 2026 An Arctic air mass is set to begin tomorrow and will affect regions spanning 2,000 miles across the country, from Texas to the East Coast. Phil Helsel, NBC news, 23 Jan. 2026 This will pull in moist Gulf air over the entrenched Arctic air mass, fueling widespread snow across central Indiana. Brandi D. Addison, IndyStar, 23 Jan. 2026 An Arctic air mass follows, locking everything in place for days. Doris Alvarez Cea, Florida Times-Union, 23 Jan. 2026 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 31 Jan. 2026.

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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