From The Collaborative International Dictionary of English v.0.48:

Oscillation \Os`cil*la"tion\, n. [L. oscillatio a swinging.]
   [1913 Webster]
   1. The act of oscillating; a swinging or moving backward and
      forward, like a pendulum; vibration.
      [1913 Webster]

   2. Fluctuation; variation; change back and forth.
      [1913 Webster]

            His mind oscillated, undoubtedly; but the extreme
            points of the oscillation were not very remote.
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   Axis of oscillation, Center of oscillation. See under
      Axis, and Center.
      [1913 Webster]
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