redundancy
1. [ noun ] the attribute of being superfluous and unneeded
Synonyms: redundance
Examples:

"the use of industrial robots created redundancy among workers"

Related terms: nimiety deadwood redound
2. [ noun ] (rhetoric) repetition of messages to reduce the probability of errors in transmission
Related terms: repetitiveness
3. [ noun ] (electronics) a system design that duplicates components to provide alternatives in case one component fails
Related terms: configuration electronics
4. [ noun ] repetition of an act needlessly
Related terms: repetition
Similar spelling:   redundance
  redundant
  redound
  Redonda
  reddened