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 gardening
    n 1: working as a landscape gardener [syn: landscaping,
         landscape gardening]