Redundancy

[Tina]

A superfluity; something redundant or excessive; a needless repetition in language

[Frankykap]

the attribute of being superfluous and unneeded

[Georgbund 0]

repetition of an act needlessly

[Kai]

Duplication of parts of a message to guard against transmission errors.

[SergioAnigo]

surplusage inserted in a pleading which may be rejected by the court without impairing the validity of what remains.

[mehmood]

Superfluity; superabundance.

[RobertFaw]

that which is redundant or in excess; anything superfluous or superabundant

[Donald Trump]

In engineering, redundancy is the duplication of critical components or functions of a system with the intention of increasing reliability of the system, usually in the case of a backup or fail-safe.
In many safety-critical systems, such as fly-by-wire and hydraulic systems in aircraft, some parts of the control system may be triplicated, which is formally termed triple modular redundancy. An error in one component may then be out-voted by the other two. In a triply redundant system, the system has three sub components, all three of which must fail before the system fails. Since each one rarely fails, and the sub components are expected to fail independently, the probability of all three failing is calculated to be extraordinarily small; often outweighed by other risk factors, e.g., human error. Redundancy may also be known by the terms majority voting systems or voting logic.

[JustiniaNex]

Redundancy is the duplication or repetition of functions, systems, or tasks to increase reliability and improve performance, often as a backup or safety measure. It can also refer to superfluous repetition or overlapping in work, language, or data, sometimes resulting in unnecessary or inefficient usage of resources.

[Guest]

@Becky not just excessive, but excessive and unnecessary bc it's something that's repetitive.
Most common usage is that a statement is redundant bc the point has already been made.

[LeeTot 0]

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