redundant

adjective6

1. •
   Superfluous; exceeding what is necessary (and therefore no longer needed because other things fulfill its task or purpose).

   • It is allowed, that Senates and great Councils are often troubled with redundant, ebullient, and other peccant Humours, with many Diseases of the Head and more of the Heart; […] — 1726
2. •
   Repetitive or needlessly wordy.
3. •
   (UK, Australia) Dismissed from employment because no longer needed.

   • Four employees were made redundant.
4. •
   Duplicating or able to duplicate the function of another component of a system, providing backup in the event the other component fails.

   • The two lines are mainly used for redundant and therefore fault-tolerant message transmission, but they can also transmit different messages. — 2013
5. •
   Containing duplicate pathways to send a message.
6. •
   Obsolete or outdated; discarded, or fit to be discarded.

   • A knocked out Panther tank lies redundant in the river. — 2013