dy·nam·ics / dīˈnamiks/ • pl. n. 1. [treated as sing.] the branch of mechanics concerned with the motion of bodies under the action of forces. Compare with statics. ∎  the branch of any science in which forces or changes are considered: chemical dynamics.2. the forces or properties that stimulate growth, development, or change within a system or process: the dynamics of changing social relations.3. Mus. the varying levels of volume of sound in different parts of a musical performance.DERIVATIVES: dy·nam·i·cist / -ˈnaməsist/ n. (in sense 1).

dynamics Branch of mechanics that deals with objects in motion. Its two main branches are: kinematics, which examines motion without regard to cause; and kinetics, which also studies the causes of motion. See also inertia; momentum

dynamics. The gradations of vol. in mus., e.g. forte, piano, crescendo, etc.