noun The collision of two bodies in order to produce a sound.
noun The sound so produced.
noun The detonation of a percussion cap in a firearm.
noun The tapping of the body as an aid to medical diagnosis.
noun The section of an orchestra or band containing percussion instruments; such instruments considered as a group; in bands, may be separate from drum kits.
noun The repeated striking of an object to break or shape it, as in percussion drilling.