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The Collaborative International Dictionary of English v.0.48 (gcide)

oscillator \os"cil*la`tor\ ([o^]s"s[i^]l*l[=a]`t[~e]r), n.
1. One that oscillates; specif.: (Electronics) Any device or
circuit for producing electric oscillations, whether of
current or voltage; esp., an apparatus for generating
electric waves in a system of wireless telegraphy.

Note: Oscillators are essential components of radio
transmission devices and digital computers, as well as
many other types of electronic device. In computers the
oscillator provides the voltage impulses which permit
information bits to be transferred between parts of the
computer in a defined sequence.
[Webster 1913 Suppl. PJC]

2. (Mech.) An instrument for measuring rigidity by the
torsional oscillations of a weighted wire.
[Webster 1913 Suppl.]

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