1An arrangement or system in which the components or constituent parts of something are dealt with in accordance with their relative proportions; proportionate treatment.
Proportional representation; the adoption or advocacy of a system of proportional representation.
Chiefly in Catholic theology: an ethical system that takes into consideration the context or consequences of an action when judging its morality.
proportionalism/prəˈpɔːʃ(ə)nəlɪz(ə)m/ /prəˈpɔːʃ(ə)n(ə)lɪz(ə)m/ /prəˈpɔːʃən(ə)lɪz(ə)m/
Mid 19th century (in an earlier sense). From proportional + -ism.