nationalism Syllabification: (na·tion·al·ism)Pronunciation: /ˈnaSHənəˌlizəm/Translate nationalism | into French | into German | into Spanish Definition of nationalism noun patriotic feeling, principles, or efforts. an extreme form of this, especially marked by a feeling of superiority over other countries. advocacy of political independence for a particular country. nationalism in other Oxford dictionaries Definition of nationalism in the British & World English dictionary