Principal clock
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Principal clock: Of a set of redundant clocks, the clock that is selected for normal use.
Note 1: The principal clock may be selected because of a property, e.g., superior accuracy, that makes it a unique member of the set.
Note 2: The term "principal clock" should not be confused with, or used as a synonym for, the term "primary frequency standard."
Source: From Federal Standard 1037C and from MIL-STD-188