The definition of a restriction is a limitation.
The condition of being restrained, especially the condition of losing one's freedom:
the prevention of something increasing or spreading (especially the prevention of an increase in the number of countries possessing nuclear weapons)
Find another word for nonproliferation. In this page you can discover 15 synonyms, antonyms, idiomatic expressions, and related words for nonproliferation, like: arms-control, restriction, limiting, holding down, holding-back, restraint, non-proliferation, proliferation, counter-proliferation, disarmament and bwc.