Pronunciation: (dī-nam'iks),[key] —n. 1. (used with a sing. v.)Physics.the branch of mechanics that deals with the motion and equilibrium of systems under the action of forces, usually from outside the system.
2. (used with a pl. v.) the motivating or driving forces, physical or moral, in any field.
3. (used with a pl. v.) the pattern or history of growth, change, and development in any field.
4. (used with a pl. v.) variation and gradation in the volume of musical sound.
5. (used with a sing. v.) psychodynamics.