dynamic
/daɪˈnæ.mɪk/
A characteristic or manner of an interaction; a behavior.
Watch the dynamic between the husband and wife when they disagree.
A moving force.
The study of fluid dynamics quantifies turbulent and laminar flows.
The varying loudness or volume of a song or the markings that indicate the loudness.
If you pay attention to the dynamics as you play, it's a very moving piece.
A symbol in a musical score that indicates the desired level of volume.
(grammar) A verb that indicates continued or progressive action on the part of the subject.