dynamics: Meaning and Definition of

dy•nam•ics

1. the branch of mechanics that deals with the motion and equilibrium of systems under the action of forces, usually from outside the system.
2. the motivating or driving forces, physical or moral, in any field.
3. the pattern or history of growth, change, and development in any field.
4. variation and gradation in the volume of musical sound.
5. psychodynamics.