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precession

noun

  1. the act of preceding; precedence
  2. Astron. precession of the equinoxes
  3. Mech. an effect exhibited by a spinning body, as a top, when an applied torque tends to change the direction of its rotational axis, causing this axis generally to describe a cone and to turn at right angles to the direction of the torque

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See precession in American Heritage Dictionary 4

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