Drift 

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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