Meaning of center of percussion

cen'ter of percus'sion

Pronunciation: [key]
— Mech. Mech.
  1. the point on a rigid body, suspended so as to be able to move freely about a fixed axis, at which the body may be struck without changing the position of the axis.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.