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

This new air mass will also help to dry us out. —Steven Sosna, CBS News, 18 Nov. 2025

The frigid air mass was already bringing powder snow and lake-effect snow to parts of the Midwest on Sunday night. —Dennis Romero, NBC news, 10 Nov. 2025

Record-setting cold to start the week This brutal setup in Chicago is being driven by the same Arctic air mass that’s about to crash across the eastern two-thirds of the country. —Briana Waxman, CNN Money, 10 Nov. 2025

Temperatures are expected to gradually moderate later in the week, but the current chill underscores the need for continued attention to weather alerts and safety practices as the unusually cold air mass exits the state. —Anna Skinner, MSNBC Newsweek, 10 Nov. 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