Origin: Latin prefix pre-
Precession of the equinoxes has 2 different meanings across 1 category:
a slow westward shift of the equinoxes along the plane of the ecliptic caused by precession of the Earth's axis of rotation
The slow westward shift of the equinoxes along the plane of the ecliptic, resulting from precession of the earth's axis of rotation, and causing the equinoxes to occur earlier each year