: the level of the ground taken as a reference point
From ground level, the arrayed fields of feed corn and soybeans look … like sprint tracks or Olympic pools, replete with the angles and alleys of serious tennis. David Foster Wallace
These survey flights were conducted at 300 feet above ground level. During the return flight to Schefferville, the aircraft descended and flew over terrain at an altitude varying between 100 and 40 feet above ground level.Targeted New Service