10 letters · 14 points in Scrabble
noun the motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out a cone
noun the act of preceding in time or order or rank (as in a ceremony)
originFrom Middle English precessioun, precession, from Medieval Latin prēcessiōn-, prēcessio, from Latin praecēdō.
Etymology from Wiktionary, CC BY-SA 3.0