1
as in fluctuation
the frequent and usually sudden passing from one condition to another
fickle springtime weather in which there seemed to be an unceasing oscillation between unseasonable heat and unseasonable cold
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2
as in vibration
a series of slight movements by a body back and forth or from side to side
the precise oscillations of the quartz crystal that allows a quartz watch to keep such accurate time
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Merriam-Webster unabridged
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