proportionality n. + Add to list US //pɹəˌpɔɹʃəˈnæɫɪti// UK //pɹəpˌɔːʃənˈælɪti// pro·por·tion·al·i·ty SynonymsEtymology Synonyms balanceproportionOriginLATproportionalitas→ENproportionality From proportional + -ity, from Latin proportionalitas.