- dynamics [dī nam′iks]n.[with pl. v. for 2a & b]1. the branch of mechanics dealing with the motions of material bodies under the action of given forces; kinetics2.a) the various forces, physical, oral, economic, etc., operating in any fieldb) the way such forces shift or change in relation to one anotherc) the study of such forces3. the effect of varying degrees of loudness or softness in the performance of music
English World dictionary. V. Neufeldt. 2014.