Ans: Percussion meaning in medical terms can be described as a way of tapping on a surface to discover the underlying structures, and it is used in clinical tests to determine the status of the thorax and abdomen. It's used to figure out things like body organ size, consistency, and borders. The presence or absence of fluid in various parts of the body. Percussion is a technique in which the examiner makes noises by tapping on the patient's chest wall. Tapping on the chest wall produces noises according to the amount of air in the lungs, just like lightly tapping on a container with your hands generates various noises.