percussion

noun

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

   “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.”

7. (countable, uncountable)The outer side of the hand.