"the height of the ground on which something stands; \"the base of the tower was below grade\""@en-us . "ground level"@en-us . "0"^^ . . . . . . "grade"@en-us . "0"^^ . . . "105132045"^^ . . . . . . "grade"^^ . "103998321"@en-us . "05132045-n"^^ . . . . "104845823"@en-us .