Source : Webster's Revised Unabridged Dictionary (1913)

Reinvigorate \Re`in*vig"or*ate\ (-v?g"?r*?t), v. t.
   To invigorate anew.

Source : WordNet®

reinvigorate
     v : impart vigor, strength, or vitality to; "Exercise is
         invigorating" [syn: {invigorate}]