redundancy

Use the noun redundancy to refer to something that's needlessly repeated. As much as you hate the redundancy of math drills, you have to admit that repetition is how you learned to multiply in the first place.

The noun redundancy can also refer to something that is unneeded, or extra. If you own a circus and you want to keep costs down by eliminating redundancy, you may decide you only need two clowns, rather than the whole carload of clowns you planned on. Redundancy comes from the Latin word redundare, meaning to surge, or literally to overflow.

Definitions of redundancy
  1. noun
    the attribute of being superfluous and unneeded
    “the use of industrial robots created redundancy among workers”
    synonyms: redundance
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    types:
    deadwood, fifth wheel
    someone or something that is unwanted and unneeded
    type of:
    embarrassment, overplus, plethora, superfluity
    extreme excess
  2. noun
    repetition of an act needlessly
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    type of:
    repeating, repetition
    the act of doing or performing again
  3. noun
    repetition of messages to reduce the probability of errors in transmission
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    type of:
    repetitiousness, repetitiveness
    verboseness resulting from excessive repetitions
  4. noun
    (electronics) a system design that duplicates components to provide alternatives in case one component fails
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    type of:
    configuration, constellation
    an arrangement of parts or elements
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