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A large body of air with only small horizontal variations of temperature, pressure, and moisture.
(Physical Geography) a large body of air having characteristics of temperature, moisture, and pressure that are approximately uniform horizontally
a body of air covering a wide area, exhibiting approximately uniform properties through any horizontal section.
A fairly uniform mass of air covering a large area and containing air of, for example, polar or tropical origin.
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|Noun||1.||air mass - a large body of air with uniform characteristics horizontally|
atmospheric state, atmosphere - the weather or climate at some place; "the atmosphere was thick with fog"
high - an air mass of higher than normal pressure; "the east coast benefits from a Bermuda high"