1. repetition of messages to reduce the probability of errors in transmission

Definition categories: communication, repetitiousness, repetitiveness

2. the attribute of being superfluous and unneeded

- the use of industrial robots created redundancy among workers

Similar word(s): redundance

Definition categories: attribute, embarrassment, overplus, plethora, superfluity

3. (electronics) a system design that duplicates components to provide alternatives in case one component fails

Definition categories: thought, configuration, constellation

4. repetition of an act needlessly

Definition categories: act, repeating, repetition