1. [v]  cause to be alert and energetic; "Coffee and tea stimulate me"; "This herbal infusion doesn't stimulate"
2. [v]  raise to a higher energy level; "excite the atoms"

Energize
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1. \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.
   

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