dynamics

UK: /daɪˈnæmɪks/ US: /daɪˈnæmɪks/ ,(dī nam′iks)

WordReference Random House Learner's Dictionary of American English © 2025

dy•nam•ics /daɪˈnæmɪks/   n. 

1. Mechanics, Physics the branch of mechanics that deals with the motion of systems that are acted on by forces from outside the system:
   [uncountable* used with a singular verb] Dynamics tells us how underwater forces work on the movement of submarines.
2. the motivating forces in a system;
   the pattern of development in a field:
   [plural* used with a plural verb] the dynamics of sound change in English.

WordReference Random House Unabridged Dictionary of American English © 2025

dy•nam•ics  (dī nam′iks), n. 

1. Mechanics, Physics (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. Music and Dance (used with a pl. v.) variation and gradation in the volume of musical sound.
5. Psychology (used with a sing. v.) psychodynamics.

• see dynamic, -ics 1780–90

Collins Concise English Dictionary © HarperCollins Publishers::

dynamics / daɪˈnæmɪks/ noun

1. (functioning as singular) the branch of mechanics concerned with the forces that change or produce the motions of bodies
   Compare statics, kinematics
2. (functioning as singular) the branch of mechanics that includes statics and kinetics
   See statics, kinetics
3. (functioning as singular) the branch of any science concerned with forces
4. those forces that produce change in any field or system
5. the various degrees of loudness called for in performance
6. Also called: dynamic marks, dynamic markings directions and symbols used to indicate degrees of loudness