1. (used with a singular verb) 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 plural verb) the motivating or driving forces, physical or moral, in any field.
  3. (used with a plural verb) the pattern or history of growth, change, and development in any field.
  4. (used with a plural verb) variation and gradation in the volume of musical sound.
  5. (used with a singular verb) psychodynamics.

adjective Also dy·nam·i·cal.

  1. pertaining to or characterized by energy or effective action; vigorously active or forceful; energetic: the dynamic president of the firm.
  2. Physics.
    1. of or relating to force or power.
    2. of or relating to force related to motion.
  3. pertaining to the science of dynamics.
  4. of or relating to the range of volume of musical sound.
  5. Computers. (of data storage, processing, or programming) affected by the passage of time or the presence or absence of power: Dynamic memory must be constantly refreshed to avoid losing data. Dynamic websites contain Web pages that are generated in real time.
  6. Grammar. nonstative.


  1. a basic or dynamic force, especially one that motivates, affects development or stability, etc.


  1. (functioning as singular) the branch of mechanics concerned with the forces that change or produce the motions of bodiesCompare statics, kinematics
  2. (functioning as singular) the branch of mechanics that includes statics and kineticsSee 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. music
    1. the various degrees of loudness called for in performance
    2. Also called: dynamic marks, dynamic markingsdirections and symbols used to indicate degrees of loudness


  1. of or concerned with energy or forces that produce motion, as opposed to static
  2. of or concerned with dynamics
  3. Also: dynamical characterized by force of personality, ambition, energy, new ideas, etc
  4. music of, relating to, or indicating dynamicsdynamic marks
  5. computing (of a memory) needing its contents refreshed periodicallyCompare static (def. 8)

as a branch of physics, 1789, from dynamic (adj.); also see -ics.


1817 as a term in philosophy; 1827 in the sense “pertaining to force producing motion” (the opposite of static), from French dynamique introduced by German mathematician Gottfried Leibnitz (1646-1716) in 1691 from Greek dynamikos “powerful,” from dynamis “power,” from dynasthai “to be able, to have power, be strong enough,” of unknown origin. The figurative sense of “active, potent, energetic” is from 1856 (in Emerson). Related: Dynamically.


“energetic force; motive force,” 1894, from dynamic (adj.).


  1. kinetics
  2. Psychodynamics.

  1. The branch of physics that deals with the effects of forces on the motions of bodies. Also called kinetics Compare kinematics.

  1. Relating to energy or to objects in motion. Compare static.
  2. Relating to the study of dynamics.
  3. Characterized by continuous change or activity.

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