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Adjective: oscillatory  'ó-su-lu,to-ree or u'si-lu,to-ree [N. Amer], u'si-lu-t(u-)ree [Brit]
  1. Having periodic vibrations
    "The oscillatory motion of the pendulum was hypnotic to watch";
    - oscillating

See also: periodic, periodical

Encyclopedia: Oscillatory