[os-uh-luh-tawr-ee, -tohr-ee]
characterized by or involving oscillation.

1730–40; < Neo-Latin oscillātōrius, equivalent to Latin oscillā(re) to swing (see oscillate) + -tōrius -tory1

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World English Dictionary
oscillation (ˌɒsɪˈleɪʃən)
1.  physics, statistics
 a.  regular fluctuation in value, position, or state about a mean value, such as the variation in an alternating current or the regular swinging of a pendulum
 b.  a single cycle of such a fluctuation
2.  the act or process of oscillating

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Example sentences
Such oscillatory dynamics are only too familiar to us, for example, in the seasonal fluctuations of influenza cases.
The oscillatory motion was imparted to this by one tentacle of the handling-machine.
The first is that this is an oscillatory phenomenon, in that when the climate changes back, the beak types change again also.
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