Definition of proportionalist in English:
proportionalist
noun prəˈpɔːʃ(ə)n(ə)lɪstprəˈpɔːʃ(ə)nəlɪstprəˈpɔːʃən(ə)lɪst
Politics. An advocate of proportional representation.
adjective prəˈpɔːʃ(ə)n(ə)lɪstprəˈpɔːʃ(ə)nəlɪstprəˈpɔːʃən(ə)lɪst
Of, relating to, or favouring proportionalism.
Origin
Mid 19th century (in an earlier sense). From proportional + -ist.