Source : Webster's Revised Unabridged Dictionary (1913)

Dynamic \Dy*nam"ic\, Dynamical \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.                  --J.
                                                  Martineau.

            The vowel is produced by phonetic, not by dynamic,
            causes.                               --J. Peile.

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

            As natural science has become more dynamic, so has
            history.                              --Prof. Shedd.

   {Dynamical electricity}. See under {Electricity}.

Source : WordNet®

dynamic
     n : an efficient incentive; "they hoped it would act as a
         spiritual dynamic on all churches" [syn: {moral force}]

dynamic
     adj 1: characterized by action or forcefulness or force of
            personality; "a dynamic market"; "a dynamic speaker";
            "the dynamic president of the firm" [syn: {dynamical}]
            [ant: {undynamic}]
     2: of or relating to dynamics
     3: expressing action rather than a state of being; used of
        verbs (e.g. `to run') and participial adjectives (e.g.
        `running' in `running water') [syn: {active}] [ant: {stative}]