the surface of a planet (such as the earth or Mars) especially : the surface of the earth or a particular part of it sometimes as contrasted with the air or sea. She sat down on the ground. a patch of uneven ground.
the surface of a planet (such as the earth or Mars) especially : the surface of the earth or a particular part of it sometimes as contrasted with the air or sea. She sat down on the ground. a patch of uneven ground.