1. In a communications circuit, a condition in which some specified characteristic of a condition, such as a value, rate, periodicity, or amplitude, exhibits only negligible change over an arbitrarily long period.
2. In an electrical circuit, the condition that exists after all initial transients or fluctuating conditions have damped out, and all currents, voltages, or fields remain essentially constant, or oscillate uniformly.
3. In fiber optics, synonym for equilibrium mode distribution[?].
Source: from Federal Standard 1037C and from MIL-STD-188
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