Etymology
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non-proliferation (n.)

also nonproliferation, "prevention of the spread of anything," especially and originally "prevention of the increase in the number of countries having nuclear weapons," 1965, from non- + proliferation.

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Definitions of non-proliferation

non-proliferation (n.)
the prevention of something increasing or spreading (especially the prevention of an increase in the number of countries possessing nuclear weapons);
Synonyms: nonproliferation
From wordnet.princeton.edu