"redundancy" in the noun sense
1. redundancy
repetition of messages to reduce the probability of errors in transmission
2. redundancy, redundance
the attribute of being superfluous and unneeded
"the use of industrial robots created redundancy among workers"
3. redundancy
electronics) a system design that duplicates components to provide alternatives in case one component fails
4. redundancy
repetition of an act needlessly
Source: WordNet® (An amazing lexical database of English)
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