proportion [proportions](the relation of one part to another or to the whole with respect to magnitude, quantity, or degree) noun [UK: prə.ˈpɔːʃ.n̩] [US: prə.ˈpɔːr.ʃn̩]
proportionality [proportionalities](the property of being proportional) noun [UK: prə.ˌpɔː.ʃə.ˈnæ.lɪ.ti] [US: prə.ˌpɔːr.ʃə.ˈnæ.lə.ti]