Source : Webster's Revised Unabridged Dictionary (1913)

Energize \En"er*gize\, v. i. [imp. & p. p. {Energized}; p. pr. &
   vb. n. {Energizing}.] [From {Energy}.]
   To use strength in action; to act or operate with force or
   vigor; to act in producing an effect.

         Of all men it is true that they feel and energize
         first, they reflect and judge afterwards. --J. C.
                                                  Shairp.

Energize \En"er*gize\, v. t.
   To give strength or force to; to make active; to alacrify;
   as, to energize the will.

Source : WordNet®

energize
     v 1: cause to be alert and energetic; "Coffee and tea stimulate
          me"; "This herbal infusion doesn't stimulate" [syn: {stimulate},
           {arouse}, {brace}, {energise}, {perk up}] [ant: {de-energize},
           {de-energize}, {sedate}]
     2: raise to a higher energy level; "excite the atoms" [syn: {excite},
         {energise}]