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Noun: precession  pree'se-shun [N. Amer], pri'se-shun [Brit]
  1. The motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out a cone
  2. The act of preceding in time, order or rank (as in a ceremony)
    - precedence, precedency

Derived forms: precessions

Type of: activity, motion

Encyclopedia: Precession