The Collaborative International Dictionary of English v.0.48:

Landscape \Land"scape\, n. [Formerly written also landskip.]
   [D. landschap; land land + -schap, equiv. to E. -schip; akin
   to G. landschaft, Sw. landskap, Dan. landskab. See Land,
   and -schip.]
   1. A portion of land or territory which the eye can
      comprehend in a single view, including all the objects it
      contains.
      [1913 Webster]

   2. A picture representing a scene by land or sea, actual or
      fancied, the chief subject being the general aspect of
      nature, as fields, hills, forests, water. etc. Compare
      seascape.
      [1913 Webster]

   3. The pictorial aspect of a country.
      [1913 Webster]

            The landscape of his native country had taken hold
            on his heart.                         --Macaulay.
      [1913 Webster]

   Landscape gardening, The art of laying out grounds and
      arranging trees, shrubbery, etc., in such a manner as to
      produce a picturesque effect.
      [1913 Webster]

WordNet (r) 3.0 (2006):

landscape
    n 1: an expanse of scenery that can be seen in a single view
    2: painting depicting an expanse of natural scenery
    3: a genre of art dealing with the depiction of natural scenery
       [syn: landscape, landscape painting]
    4: an extensive mental viewpoint; "the political landscape looks
       bleak without a change of administration"; "we changed the
       landscape for solving the problem of payroll inequity"
    v 1: embellish with plants; "Let's landscape the yard"
    2: do landscape gardening; "My sons landscapes for corporations
       and earns a good living"

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "landscape":
   airscape, aspect, cityscape, cloudscape, countryside, diorama,
   exterior, farmscape, interior, lookout, outlook, panorama,
   pastoral, perspective, prospect, riverscape, scape, scene, scenery,
   scenic view, seapiece, seascape, sight, skyscape, snowscape, sweep,
   townscape, view, vista, waterscape