A more thorough explanation:

Definition: Hosticide (hos-tə-sId) is the act of killing an enemy or a person who kills an enemy.

• During the war, soldiers were trained to commit hosticide against the enemy.
• The assassin was hired to carry out hosticide against the political leader.

The first example illustrates how hosticide is used in the context of war. Soldiers are trained to kill the enemy, which is an act of hosticide. The second example shows how hosticide can also refer to a person who is hired to kill an enemy, in this case, a political leader.