Redundancy (noun)

1. The state of being no longer needed or useful.
2. The state of having more employees than are required for the efficient operation of a company, resulting in some employees being laid off.

Origin:

Mid 19th century: from redundant, on the pattern of pairs such as opacity, opacification.

Examples:

1. The redundancy of the manual typewriter was a result of the widespread use of computers.
2. The redundancy of the older employees was a result of the company's reorganization.
3. The redundancy of the manual process was replaced by automation.
4. The redundancy of the previous model made it less appealing to customers.
5. The redundancy of the system was a concern in the event of a power failure.