Electronics. a circuit that produces an alternating output current of a certain frequency determined by the characteristics of the circuit components.
a device or machine producing oscillations.
a person or thing that oscillates.

1825–35; < Neo-Latin, equivalent to Latin oscillā(re) to swing (see oscillate) + -tor -tor

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World English Dictionary
oscillator (ˈɒsɪˌleɪtə)
1.  a circuit or instrument for producing an alternating current or voltage of a required frequency
2.  any instrument for producing oscillations
3.  a person or thing that oscillates

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

agent noun from oscillate; 1835 of persons, 1889 in reference to electric currents.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The engineered form lost its internal oscillator and therefore stopped
  producing spores in spurts.
The oscillator is a light wave produced by a laser that oscillates at one
  million billion times per second.
For example think of the local minimum of a harmonic oscillator.
The bacteria represent the first synchronized genetic oscillator.
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