jitters, nervousness; a feeling of fright or uneasiness (usually preceded by the ): Every time I have to make a speech, I get the jitters.
fluctuations in the image on a television screen or in copy received by facsimile transmission, caused by interference or by momentary failures of synchronization.
verb (used without object)
to behave nervously.

1920–25; variant of chitter to shiver (Middle English chiteren), gradational variant of chatter

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World English Dictionary
jitter (ˈdʒɪtə)
1.  (intr) to be anxious or nervous
2.  the jitters nervousness and anxiety
3.  electronics small rapid variations in the amplitude or timing of a waveform arising from fluctuations in the voltage supply, mechanical vibrations, etc
[C20: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Computing Dictionary

jitter definition

Random variation in the timing of a signal, especially a clock.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
But they were ignored as the financial markets shrugged off one jitter after
Voice traffic therefore suffers from the lowest possible jitter.
The unreliable controllers would sometimes cause the motor to jitter.
Voice requires a pretty good quality of service, so there's not latency or
  jitter on the packets as they go through.
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