dynamics (Noun) — The branch of mechanics concerned with the forces that cause motions of bodies.
dynamics (Noun) — (music) varying loudness of sound; markings in a musical score that indicates the desired level of volume.
dynamics (Noun) — An efficient incentive. ex. "they hoped it would act as a spiritual dynamic on all churches"
dynamics (Noun) — A characteristic or manner of an interaction; a behaviour. ex. "Watch the dynamic between the husband and wife" ex. "The story is about a child who makes a friend and how the dynamic of their play evolves"