V0013300 (vă-lā′shən)n.1. An earthwork wall used for military defense; a rampart.2. The process of planning or erecting earth fortifications.[Late Latin vallātiō, vallātiōn-, from Latin vallātus, past participle of vallāre, to surround with a rampart, from vallum, rampart, from vallus, stake.]val′la·to′ry(văl′ə-tôr′ē) adj.