A sampling phenomenon produced when a waveform is not sampled uniformly at an interval 
each time, but rather at a series of slightly shifted intervals
such that the average 
.
Jitter
See also
Ghost, SamplingExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Jitter." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Jitter.html