noun (n)

• the phenomenon of vitality and freshness being restored(noun.phenomenon)

  Example:
  The annual rejuvenation of the landscape.
  

  Synonym:
  greening
  

  source: wordnet30
• the act of restoring to a more youthful condition(noun.act)

  source: wordnet30
• Rejuvenescence.(noun)

  source: webster1913