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Definition of Aquifer:
Underground layer of water-bearing permeable rock, rock fractures or unconsolidated materials (gravel, sand, or silt).
This is the common definition for Aquifer, other definitions can be discussed in the article

A confined aquifer is an aquifer that is overlain by a confining poorly permeable layer.

An unconfined aquifer is an aquifer extending from the land surface to the base of the aquifer.

See also Wikipedia