nonintervention Syllabification: (non·in·ter·ven·tion)Pronunciation: /ˌnänintərˈvenCHən/Definition of nonintervention noun the principle or practice of not becoming involved in the affairs of others. a policy of nonintervention adopted by a country in its international relations. Derivatives noninterventionismPronunciation: /-ˌnizəm/ noun noninterventionistPronunciation: /-nist/ adjective & noun nonintervention in other Oxford dictionaries Definition of nonintervention in the British & World English dictionary