redundant

adj

1. Superfluous; exceeding what is necessary, no longer needed.

   “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; […]”

   “In the living state, the body is observed to receive aliment; to assimilate a part; to evacuate what is redundant or useless; […]”

   “A key driver has been the approval of a new housing and employment development called Fawley Waterside, with 1,500 homes planned on the site of a redundant power station on the edge of Southampton Water.”

   “Two entrants shared this award for their work on two quite different stations, but with the same purpose of bringing a redundant station building back into use for the benefit of the community, with the added result of conserving an historic building.”

2. Repetitive or needlessly wordy.
3. (Australia, British, Ireland, New-Zealand)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.”

5. Containing duplicate pathways to send a message.