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From 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]