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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Unstable air could fuel storms Friday is the main concern as a very unstable air mass moves in and could fuel severe storms, especially in the afternoon and evening. Kansas City Star, 14 May 2026 Once the front clears the area Saturday night, a much cooler air mass will settle in for the second half of the weekend. Ahmad Bajjey, CBS News, 8 May 2026 Behind the front, wind flow is shifting out of the north and northeast, reinforcing the cooler air mass. Brandi D. Addison, USA Today, 30 Apr. 2026 South Florida will be unseasonably cool this week, as a passing cold front ushers in a dry, breezy air mass that will dominate weather for most of the week. Bill Kearney, Sun Sentinel, 20 Apr. 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 21 May. 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

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