ground level

Noun ground level has 2 senses

• ground level(n = noun.attribute) grade - the height of the ground on which something stands; "the base of the tower was below grade"
is a kind of elevation

• ground level(n = noun.artifact) first floor, ground floor - the floor of a building that is at or nearest to the level of the ground around the building;
is a kind of floor, level, storey, story