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Drift
In telecommunication, a drift is a comparatively long-term change in an attribute or value of a system or equipment operational parameter.
Note 1: The drift should be characterized, such as "diurnal frequency drift[?]" and "output level drift."
Note 2: Drift is usually undesirable and unidirectional, but may be bidirectional, cyclic, or of such long-term duration and low excursion rate as to be negligible.
Source: from Federal Standard 1037C and from MIL-STD-188
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