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Ground: A term that describes anything having an electrical potential of zero relative to other points in a circuit. Most modern vehicles are designed around a negative ground system, with the metal . . . View Full Definition

Ground Lease: A lease of land alone, sometimes secured by improvements placed on the land. Also called a land lease, the ground lease is a means used to separate the ownership of the land from the ownersh . . . View Full Definition

Groundwater: Water under the earths surface, regardless of the geological structure in which the water is standing or flowing. It does not include water in underground streams that have identifiable bank . . . View Full Definition

Underground Storage Tanks (USTS): USTs are commonly used for storing petroleum products, chemicals or process wastes. Sites which use USTs include airports, gas stations, industrial locations and military bases. Over time ne . . . View Full Definition

Underground Storage Tank: For purposes of Subtitle I of the Resource Conservation and Recovery Act, this is any tank used to store petroleum or hazardous substances regulated under the Comprehensive Environmental Res . . . View Full Definition

Ground State: The lowest energy state for an atom or molecule. When an atom is in its ground state, its electrons fill the lowest energy orbitals completely before they begin to occupy higher energy orbit . . . View Full Definition

Grounder: A ground ball.

Intentional Grounding: A type of illegal forward pass; thrown without an intended receiver and no chance of completion to any offensive player, for the sole purpose of conserving time or loss of yardage. This foul . . . View Full Definition

Foreground: The area of a painting closest to the viewer. In a landscape this would include the area from the viewer to the middle distance. See Background, Middle ground.

Ground Fog: Fog created when radiational cooling at the earth's surface lowers the temperature of the air near the ground to or below its initial dew point. Primarily takes place at night or early morning.