dynamism

noun

any of various theories or philosophical systems that seek to explain phenomena of nature by the action of force.Compare mechanism(def 8), vitalism(def 1).
great energy, force, or power; vigor: the dynamism of the new governor.
Psychology. a habitual mode of reducing or eliminating tension.

noun

philosophy any of several theories that attempt to explain phenomena in terms of an immanent force or energyCompare mechanism (def. 5), vitalism
the forcefulness of an energetic personality

1831, “dynamic energy, force, drive,” from Greek dynamis “power, might, strength” (see dynamic (adj.)) + -ism. As a philosophical system, from 1857.