federalism Syllabification: (fed·er·al·ism)Pronunciation: /ˈfed(ə)rəˌlizəm/Definition of federalism noun the federal principle or system of government:the politics of federalism in Canada (Federalism) the principles of the Federalist Party. in Canada, support of confederation in opposition to Quebec separatism. federalism in other Oxford dictionaries Definition of federalism in the British & World English dictionary