Etymology

dynamic (adj.)

by 1812, "pertaining to mechanical forces not in equilibrium, 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," which is of unknown origin. The figurative sense of "active, potent, effective, energetic" is from 1856 (in Emerson). Related: Dynamically.

dynamic (n.)

"energetic force; motive force," 1894, from dynamic (adj.). As "manner of interaction," by 1978.

Definitions of dynamic
1
dynamic (adj.)
characterized by action or forcefulness or force of personality;
a dynamic speaker
the dynamic president of the firm
a dynamic market
Synonyms: dynamical
dynamic (adj.)
of or relating to dynamics;
dynamic (adj.)
(used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water')) expressing action rather than a state of being;
Synonyms: active
2
dynamic (n.)
an efficient incentive;
they hoped it would act as a spiritual dynamic on all churches
Synonyms: moral force
From wordnet.princeton.edu