kə̇ˈned.]iks, kīˈ-, -et], ]ēks\ noun plural but singular or plural in construction
1. : a branch of dynamics that deals with the effects of forces upon the motions of material bodies
2.
a. : a branch of physical science that deals with the rate of change in a physical or chemical system ; specifically : reaction kinetics
b. : the rate of change or reaction in such a system
c. : the mechanism by which a physical or chemical change is effected
the kinetics of the acid-catalyzed reaction between organic acids and alcohols — C.E.Leyes