bioregionalism Syllabification: (bi·o·re·gion·al·ism)Pronunciation: /ˌbīōˈrējənlˌizəm/Definition of bioregionalism noun advocacy of the belief that human activity should be largely restricted to distinct ecological and geographical regions. Derivatives bioregionalist noun bioregionalism in other Oxford dictionaries Definition of bioregionalism in the British & World English dictionary