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Synonyms
os·cil·late (ŏśə-lāt́)

[Latin ōscillāre, ōscillāt-, from ōscillum, swing, probably from ōscillum, small mask of Bacchus diminutive of ōs, mouth.]

intransitive verb: -lat·ed, -lat·ing, -lates. 

  1. To swing back and forth with a steady, uninterrupted rhythm.
  2. To waver, as between conflicting opinions or courses of action; vacillate: “The court has oscillated over the decades from more liberal to less, more conservative to less, depending upon who was president at the time of vacancies” (Gordon J. Humphrey) See synonyms at swing
  3. Physics To vary between alternate extremes, usually within a definable period of time.

derivatives

ościl·látor
noun
ościl·la·tóry
adjective