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