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
a state of violent disturbance and disorder (as in politics or social conditions generally); "the industrial revolution was a period of great turbulence"
harsh or severe speech or behavior; "men associate the roughness of nonstandard working-class speech with masculinity"; "the roughness of her voice was a signal to keep quiet"
a texture of a surface or edge that is not smooth but is irregular and uneven