In international law. Indifferent; impartial; not engaged on either side; not taking an active part with either of the contending states. In an international war, the principal hostile powers are called “belligerents;” those actively cooperating with and assisting them, their “allies;” and those taking no part whatever, “neutrals” Neutral property. Property which belongs to citizens of neutral powers, and is used, treated, and accompanied by proper insignia as such.