kinetics Syllabification: (ki·net·ics)Pronunciation: /kəˈnetiks/Translate kinetics | into French | into Italian Definition of kinetics noun [usually treated as singular] the branch of chemistry or biochemistry concerned with measuring and studying the rates of reactions. [usually treated as plural] the rates of chemical or biochemical reaction. Physics the study of forces acting on mechanisms. kinetics in other Oxford dictionaries Definition of kinetics in the British & World English dictionary