redundancy

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun repetition of messages to reduce the probability of errors in transmission
noun the attribute of being superfluous and unneeded
noun (electronics) a system design that duplicates components to provide alternatives in case one component fails

From redundant + -cy.

The second of these was omitted to avoid redundancy for the reader. — Daisy Ashford: Her Book, Daisy Ashford
Premisses are thus quite different from data--they are simpler, more precise, and less infected with logical redundancy. — Our Knowledge of the External World as a Field for Scientific Method in Philosophy, Bertrand Russell
She had asked them with a redundancy of polite phrases to take Lucy under their protection as far as they might be travelling together. — The Man Who Did the Right Thing: A Romance, Harry Johnston

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