Home › Words › P › proportionalityproportionality/pɹəpɔɹʃəˈnæləti/proportionality means the property of being proportional.proportionality is pronounced /pɹəpɔɹʃəˈnæləti/.EtymologyFrom proportional + -ity, from Latin proportionalitas.nounthe property of being proportionalthe principle that government action ought to be proportional to the ends achieved (e.g. the military should not be deployed to stop petty vandalism)the degree to which something is in proportionDefinitions & examples from Wiktionary (CC BY-SA 3.0).