It means that the direction of an axis of rotation changes over time.

The star Vega in the constellation Lyra will be the North Star by 14000 AD because of Earth's precessional motion.

Hipparchus is best known for his discovery of the precessional movement of the equinoxes. The alterations of the measured positions of the stars resulting from the movement of the points of intersection of the ecliptic and of the celestial equator.

Motion is already involves in motion because the motion is motion

Some examples of motion are-random motion,periodic motion,rotatory motion,circular motion and osclitory motion