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In engineering and systems theory, redundancy is the intentional duplication of critical components or functions of a system with the goal of increasing reliability of the system, usually in the form of a backup or fail-safe, or to improve actual system performance, such as in the case of GNSS receivers, or multi-threaded computer processing.
Redundancy (information theory), the number of bits used to transmit a message minus the number of bits of actual information in the message; Redundancy in total quality management, quality which exceeds the required quality level, creating unnecessarily high costs; The same task executed by several different methods in a user interface
In linguistics, a redundancy is information that is expressed more than once. [ 1 ] [ 2 ] Examples of redundancies include multiple agreement features in morphology , [ 1 ] multiple features distinguishing phonemes in phonology , [ 2 ] or the use of multiple words to express a single idea in rhetoric . [ 1 ]
Linguists usually call this redundancy to avoid confusion with syntactic pleonasm, a more important phenomenon for theoretical linguistics. It usually takes one of two forms: Overlap or prolixity. Overlap: One word's semantic component is subsumed by the other: "Receive a free gift with every purchase."; a gift is usually already free.
Employee attrition, employee turnover, and employee churn all refer to an employee quitting the job, and are often used as synonyms. For the first two terms, the difference is due to the context, i.e., the reasons for the employee leaving.
The quantity is called the relative redundancy and gives the maximum possible data compression ratio, when expressed as the percentage by which a file size can be decreased. (When expressed as a ratio of original file size to compressed file size, the quantity R : r {\displaystyle R:r} gives the maximum compression ratio that can be achieved.)
The term "failover", although probably in use by engineers much earlier, can be found in a 1962 declassified NASA report. [2] The term "switchover" can be found in the 1950s [3] when describing '"Hot" and "Cold" Standby Systems', with the current meaning of immediate switchover to a running system (hot) and delayed switchover to a system that needs starting (cold).
In francophone Belgium, the term Procédure Renault has become a synonym for the consultation process leading to mass redundancies, due to a controversial mass layoff and resultant legislation in the late 1990s. When an employee has been laid off in Australia their employer has to give them redundancy pay, which is also known as severance pay.