When a country reduces or eliminates its military weapons, or arms, it's called disarmament. Nuclear disarmament is the reduction of nuclear weapons around the world.

After wars, countries often deal with disarmament, reducing the arms on both sides in a balanced way. Proponents of nuclear disarmament aim for the same thing, often with the ultimate goal being complete elimination of all weapons of mass destruction. Disarmament adds the "not" or "do the opposite of" prefix dis- to armament, from a Latin root meaning "furnish with weapons."

Definitions of disarmament
  1. noun
    act of reducing or depriving of arms
    “the disarmament of the aggressor nations must be complete”
    synonyms: disarming
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    armament, arming, equipping
    the act of equiping with weapons in preparation for war
    type of:
    demobilisation, demobilization
    act of changing from a war basis to a peace basis including disbanding or discharging troops
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