Redundant does not mean repetitive. People sometimes get confused because the ‘re’ in redundant suggests repetition. In fact, the word has a totally unrelated meaning. Redundant means unnecessary or superfluous.
Many parts became redundant when we converted to the new equipment.
The word can also be used to refer to components in a system placed there as back-up equipment.
The shuttle’s auxiliary power unit has built-in redundancy to protect the crew in the event of failure.
Further, when something is repetitive it is redundant. But just because something is redundant does not mean it is repetitive. Get it?
(UPDATE: See the comment below and my reply. My point of this post was to distinguish between the two terms. I see Mary’s point, though, and accept that other examples may exist.)
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