ground level

from WordNet (r) 3.0 (2006)
ground level
    n 1: the height of the ground on which something stands; "the
         base of the tower was below grade" [syn: {grade}, {ground
         level}]
    2: the floor of a building that is at or nearest to the level of
       the ground around the building [syn: {ground floor}, {first
       floor}, {ground level}]
    

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