Meaning

noun any of the various theories or doctrines or philosophical systems that attempt to explain the phenomena of the universe in terms of some immanent force or energy

noun active strength of body or mind

noun the activeness of an energetic personality

originFrom English dynam(ic) (or directly from Ancient Greek δύναμις (dúnamis, “power”)) + ism.

Etymology from Wiktionary, CC BY-SA 3.0