Main Entry: ki·net·ics

Pronunciation: \kə-ˈne-tiks also kī-\

Function: noun plural but singular or plural in construction

Date: circa 1859

1 a : a branch of science that deals with the effects of forces upon the motions of material bodies or with changes in a physical or chemical system b : the rate of change in such a system
2 : the mechanism by which a physical or chemical change is effected