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In telecommunication, the term degradation has the following meanings:
1. The deterioration in quality, level, or standard of performance of a functional unit.
2. In communications, a condition in which one or more of the required performance parameters fall outside predetermined limits, resulting in a lower quality of service.
Note: Degradation is usually categorized as either "graceful" or "catastrophic."
Source: from Federal Standard 1037C
There are several forms and causes of degradation in electric signals, both in the time domain and in the physical domain:
runt pulse, spike, jitter, wander, swim, drift, glitch, ringing, crosstalk, antenna effect, phase noise
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