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Definition of Unsaturated zone

Unsaturated zone Definition from Science & Technology Dictionaries & Glossaries
Glossary of water terms
the zone immediately below the land surface where the pores contain both water and air, but are not totally saturated with water. These zones differ from an aquifer , where the pores are saturated with water.
Unsaturated zone Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
The vadose zone, also termed the unsaturated zone, is the part of Earth between the land surface and the top of the phreatic zone i.e. the position at which the groundwater (the water in the soil's pores) is at atmospheric pressure ("vadose" is from the Latin for "shallow"). Hence the vadose zone extends from the top of the ground surface to the water table. Water in the vadose zone has a pressure head less than atmospheric pressure, and is retained by a combination of adhesion (funiculary groundwater), and capillary action (capillary groundwater). If the vadose zone envelops soil, the water contained therein is termed soil moisture. In fine grained soils, capillary action can cause the pores of the soil to be fully saturated above the water table at a pressure less than atmospheric. The vadose zone does not include the area that is still saturated above the water table, often referred to as the capillary fringe (Freeze & Cherry, 1979).

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Unsaturated zone Definition from Society & Culture Dictionaries & Glossaries
EPA Terms of Environment
The area above the water table where soil pores are not fully saturated, although some water may be present.
Provided as a public service by the U.S. Environmental Protection Agency
Environmental Engineering (English ver.)
The subsurface zone, usually starting at the land surface, that contains both water and air; also called the vadose zone or zone of aeration.