percussion

1. (countable) The collision of two bodies in order to produce a sound.countable

2. (countable) The sound so produced.countable

3. (countable) The detonation of a percussion cap in a firearm.countable

4. (medicine) The tapping of the body as an aid to medical diagnosis.countableuncountable

5. (music) The section of an orchestra or band containing percussion instruments; such instruments considered as a group; in bands, may be separate from drum kits.countableuncountable

6. (engineering) The repeated striking of an object to break or shape it, as in percussion drilling.Examples: "Moreover, a perfect Medal has its Profile and out-ſtroaks ſharp (Nummus aſper) and by no means rugged; the Figures clean and well poliſh'd; the Contours neatly trimm'd, and exactly round and carefully preſerv'd; that the Extancy and Relievos correſpond with the Ingraving, and have not ſuffer'd in Percuſſion; in all which, there is a certain Spirit of Antiquity and Excellency to be diſcern'd in Antient Medals almoſt inimitable."countableuncountable