noun 1.abstention by a nation from interference in the affairs of other nations or in those of its own political subdivisions.
2.failure or refusal to intervene.
Related forms non·in·ter·ven·tion·al, adjective
non·in·ter·ven·tion·al·ist, noun
non·in·ter·ven·tion·ism, noun
non·in·ter·ven·tion·ist, noun, adjective