What mean by the disarmament

Disarmament, in international relations, any of four distinct conceptions:
(1) the penal destruction or reduction of the armament of a country defeated in war (the provision under the Versailles Treaty [1919] for the disarmament of Germany and its allies is an example of this conception of disarmament);
(2) bilateral disarmament agreements applying to specific geographic areas (naval disarmament in this sense is represented by the Rush-Bagot Agreement between the United States and Great Britain, which, since 1817, has kept the Great Lakes disarmed);
(3) the complete abolition of all armaments, as advocated by utopian thinkers and occasionally by governments; and
(4) the reduction and limitation of national armament by general international agreement through such international forums as the League of Nations, in the past, and the United Nations, in the present. This last is the most frequent current use of the term.