noun (n)

• all the plant life in a particular region or period(noun.group)

  Example:
  Pleistocene vegetation.
  

  Synonym:
  botany, flora
  Antonym:
  fauna, zoology
  

  source: wordnet30
• the process of growth in plants(noun.process)

  source: wordnet30
• an abnormal growth or excrescence (especially a warty excrescence on the valves of the heart)(noun.body)

  source: wordnet30
• inactivity that is passive and monotonous, comparable to the inactivity of plant life(noun.act)

  Example:
  Their holiday was spent in sleep and vegetation.
  

  source: wordnet30
• The act or process of vegetating, or growing as a plant does; vegetable growth.(noun)

  source: webster1913