nonaggression Syllabification: (non·ag·gres·sion)Pronunciation: /ˌnänəˈgreSHən/Definition of nonaggression noun absence of the desire or intention to be aggressive, especially on the part of nations or governments:a treaty of nonaggression and friendship [as modifier]:a nonaggression pactnonaggression in other Oxford dictionaries Definition of nonaggression in the British & World English dictionary