Source : Webster's Revised Unabridged Dictionary (1913)

Overpower \O"ver*pow`er\, n.
   A dominating power. --Bacon.

Overpower \O`ver*pow"er\, v. t. [imp. & p. p. {Overpowered}; p.
   pr. & vb. n. {Overpowering}.]
   To excel or exceed in power; to cause to yield; to vanquish;
   to subdue; as, the light overpowers the eyes. ``And
   overpower'd that gallant few.'' --Wordsworth.

   Syn: To overbear; overcome; vanquish; defeat; crush;
        overwhelm; overthrow; rout; conquer; subdue.

Source : WordNet®

overpower
     v 1: overcome by superior force [syn: {overmaster}, {overwhelm}]
     2: overcome, as with emotions or perceptual stimuli [syn: {overwhelm},
         {sweep over}, {whelm}, {overcome}, {overtake}]