World English Dictionary
precession (prɪˈsɛʃən)
1.  the act of preceding
2.  See precession of the equinoxes
3.  the motion of a spinning body, such as a top, gyroscope, or planet, in which it wobbles so that the axis of rotation sweeps out a cone
[C16: from Late Latin praecessiō a going in advance, from Latin praecēdere to precede]

Collins English Dictionary - Complete & Unabridged 10th Edition
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