Source : Webster's Revised Unabridged Dictionary (1913)

Rejuvenation \Re*ju`ve*na"tion\ (-n?"sh?n), n.
   Rejuvenescence.

Source : WordNet®

rejuvenation
     n 1: the phenomenon of vitality and freshness being restored;
          "the annual rejuvenation of the landscape" [syn: {greening}]
     2: the act of restoring to a more youthful condition