All 5 Uses

redundant
in
The Moon is a Harsh Mistress
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I conjecture that the monosyllabic form could be confused with the causation inquiry monosyllable through insufficient redundancy and without intention of punning.†
Chpt 4
Where shares one, that's its link, one direction or both—but one is enough for a multipli-redundant communication net.†
Chpt 5
All three report it—redundancy, necessary to any communication system—but follow Egbert's yell for help.†
Chpt 5
Any method of communication needs redundancy, or information can be lost.
Chpt 12 *

redundancy = a secondary component designed to work if the primary component fails
Was at redundancy that Mike nibbled, with perfect patience of machine.†
Chpt 12

Definitions:

(1) (redundant)
more than is needed -- often something that is unnecessarily repeated

or in technical usage: describing a secondary component designed to work if the primary component fails
(2) (meaning too rare to warrant focus)