{ Dy*nam"ic (?), Dy*nam"ic*al (?), } a. [Gr. &?; powerful, fr. &?; power, fr. &?; to be able; cf. L. durus hard, E. dure: cf. F. dynamique.] 1. Of or pertaining to dynamics; belonging to energy or power; characterized by energy or production of force.

Science, as well as history, has its past to show, -- a past indeed, much larger; but its immensity is dynamic, not divine.

The vowel is produced by phonetic, not by dynamic, causes.

2. Relating to physical forces, effects, or laws; as, dynamical geology.

As natural science has become more dynamic, so has history.

• Changeable; fluid; not steady; in motion.
       The environment is dynamic, changing with the years and the seasons.
       He was a dynamic and engaging speaker.
  
• (computing) Able to change
  
• Powerful
  
• A characteristic or manner of an interaction; a behavior.
       Watch the dynamic between the husband and wife when they disagree.
       The study of fluid dynamics quantifies turbulent and laminar flows.
  
• (music) The varying loudness or volume of a song or the markings that indicate the loudness.
       If you pay attention to the dynamics as you play, it's a very moving piece.