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

Clouds will break up during the afternoon, with winds turning more southwesterly as a spring-like dry line or the frontal boundary of a dry air mass moves over the area. —Newsroom Meteorologist, Austin American Statesman, 8 Jan. 2026

That new air, from an air mass that descended from the north, has been bolstered by increasing high pressure. —Rick Hurd, Mercury News, 8 Jan. 2026

After the front completely pushes east, a cooler and drier air mass will encompass North Texas. —Lauren Bostwick, CBS News, 5 Jan. 2026

The return to colder, more seasonable conditions after the recent stretch of record-breaking springlike warmth is thanks to a frigid Arctic air mass moving in behind the winter storm. —Briana Waxman, CNN Money, 29 Dec. 2025

Word History

First Known Use

1882, in the meaning defined above

Rhymes for air mass

• alas
• amass
• bromegrass
• bypass
• chagas
• crabgrass
• crevasse
• eelgrass
• eyeglass
• groundmass
• harass
• impasse

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