Etymology
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redundancy (n.)

c. 1600, "condition of superfluity, overabundance;" see redundant + -ancy. The meaning "that which is redundant" is by 1630s; the sense in employment ("superfluous jobs, jobs in excess of what are necessary") is by 1931, chiefly British.

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Definitions of redundancy

redundancy (n.)
repetition of messages to reduce the probability of errors in transmission;
redundancy (n.)
the attribute of being superfluous and unneeded;
the use of industrial robots created redundancy among workers
Synonyms: redundance
redundancy (n.)
(electronics) a system design that duplicates components to provide alternatives in case one component fails;
redundancy (n.)
repetition of an act needlessly;
From wordnet.princeton.edu