precession /pri-seshˈən/

1. The fact or act of preceding
2. A progression or going forward (non-standard for procession; obsolete)
3. The precession of the equinoxes (see below) or the analogous phenomenon in spinning tops and the like, whereby the wobble of the spinning object causes its axis of rotation to become cone-shaped

precess /-sesˈ/ intransitive verb

(back-formation from precession; of a spinning-top, etc) to wobble

precessˈional adjective

precession of the equinoxes

A slow westward motion of the equinoctial points along the ecliptic, caused by the greater attraction of the sun and moon on the excess of matter at the equator, such that the times at which the sun crosses the equator come at shorter intervals than they would otherwise do

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