The center of inertia is a point in a body or system of bodies where the total rotational inertia of the body or system is concentrated.

The inertias of the system prevent it from accelerating quickly.

The feather floated through the air, showing its inertialess nature.

The car continued moving inertially even after the engine was turned off.

The objects in motion tend to stay in motion due to inertiae.

Inertial spaces are reference frames that are not accelerating.

The inertiæ of the objects prevented them from moving.

The sedimentary rock contains abundant inertinites.

The coal sample contains a significant amount of inertinitic material.

Inertinite is a type of oxidized organic material found in coal deposits.