The Collaborative International Dictionary of English v.0.48:

Vegetation \Veg`e*ta"tion\, n. [Cf. F. v['e]g['e]tation, L.
   vegetatio an enlivening. See Vegetable.]
   [1913 Webster]
   1. The act or process of vegetating, or growing as a plant
      does; vegetable growth.
      [1913 Webster]

   2. The sum of vegetable life; vegetables or plants in
      general; as, luxuriant vegetation.
      [1913 Webster]

   3. (Med.) An exuberant morbid outgrowth upon any part,
      especially upon the valves of the heart.
      [1913 Webster]

   Vegetation of salts (Old Chem.), a crystalline growth of an
      arborescent form.
      [1913 Webster]