The Collaborative International Dictionary of English v.0.48:

Weald \Weald\, n. [AS. See Wold.]
   A wood or forest; a wooded land or region; also, an open
   country; -- often used in place names.
   [1913 Webster]

         Fled all night long by glimmering waste and weald,
         And heard the spirits of the waste and weald
         Moan as she fled.                        --Tennyson.
   [1913 Webster]

   Weald clay (Geol.), the uppermost member of the Wealden
      strata. See Wealden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

weald
    n 1: an area of open or forested country

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "weald":
   alkali flat, alluvial plain, basin, bottomland, bushveld, campo,
   champaign, champaign country, coastal plain, delta, desert, down,
   downs, fell, flat, flat country, flatland, flats, grass veld,
   grassland, heath, lande, level, llano, lowland, lowlands,
   lunar mare, mare, mesa, mesilla, moor, moorland, open country,
   pampa, pampas, peneplain, plain, plains, plateau, playa, prairie,
   salt flat, salt marsh, salt pan, savanna, sebkha, steppe, table,
   tableland, timber, timberland, tree veld, tundra, upland, vega,
   veld, wide-open spaces, wold, woodland, woods