The Collaborative International Dictionary of English v.0.48:

Electrocute \E*lec"tro*cute`\, v. t. [Electro- + cute in
   execute.]
   To execute or put to death by electricity. --
   E*lec`tro*cu"tion, n.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

electrocution \electrocution\ n.
   1. execution by electricity.

   Note: Electrocution as a form of punishment for crime is
         usually carried out while the victim is sitting in a
         chair specially designed for the purpose, called an
         electric chair, fitted with electrodes that contact the
         head and limbs. To be executed in such a manner is
         sometimes referred to in grim humor as to ride the
         lightning.

   Syn: burning.
        [WordNet 1.5 +PJC]

   2. killing by electric shock.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

electrocution
    n 1: execution by electricity [syn: electrocution, burning]
    2: killing by electric shock

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "electrocution":
   beheading, burning, capital punishment, crucifixion, decapitation,
   decollation, defenestration, execution, fusillade, garrote,
   gassing, hanging, hemlock, judicial murder, lapidation,
   necktie party, poisoning, shooting, stoning, strangling,
   strangulation, the ax, the block, the chair, the gallows,
   the gas chamber, the guillotine, the hot seat, the rope