Aquifer- A body of rock that contains sufficient saturated permeable material to conduct ground water and to yield economically significant quantities of ground water to wells and springs.
ref: AGI Glossary of Geology
Aquifer- An aquifer is a formation, group of formations, or part of a formation that is water-bearing.
ref: Meinzer, O.E., 1923
Aquifer- A geologic formation, group of such formations, or a part of such a formation that is water-bearing. An aquifer may consist of a stratum or zone of rock below the surface of the earth capable of containing and producing water as from a well.
ref: Rules of the Ga DNR, EPD, Groundwater Use