com·men·su·ra·tion \kəˌmen(t)səˈrāshən also -menchəˈ-\noun (-s) Etymology: Middle French, from Late Latin commensuration, commensuratio, from Latin com- + Late Latin mensuration-, mensuratio act of measuring — more at mensuration 1.: the measuring of things in comparison with one another 2.: the state of being proportionate < fitness lies in a particular commensuration … of one thing to another — Robert South >