Wiktionary
centre of inertia
alt. 1 (context rare dated English) The centre of mass. 2 (context rare rotational dynamics English) A point, near or within a body, at which the body's mass can be assumed to be concentrated when considering its rotational motion and moment of inertia. This may be different from its centre of mass which is the equivalent for linear motion. n. 1 (context rare dated English) The centre of mass. 2 (context rare rotational dynamics English) A point, near or within a body, at which the body's mass can be assumed to be concentrated when considering its rotational motion and moment of inertia. This may be different from its centre of mass which is the equivalent for linear motion.