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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.
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 ]
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
Pleonasm can serve as a redundancy check; if a word is unknown, misunderstood, misheard, or if the medium of communication is poor—a static-filled radio transmission or sloppy handwriting—pleonastic phrases can help ensure that the meaning is communicated even if some of the words are lost. [citation needed]
"Wandering planet" – the word planet comes from the Greek word 'πλανήτης (planḗtēs), which itself means "wanderer". "If you know, you know", a common English phrase. "A pair of two"; by its nature, a pair is two items, so "a pair of two" is redundant. "What's for you won't go by you", a Scottish proverb that is tautological
The redundancy compensation payment for employees depends on the length of time an employee has worked for an employer which excludes unpaid leave. If an employer can't afford the redundancy payment they are supposed to give their employee, once making them redundant, or they find their employee another job that is suitable for the employee.
The result is an industry based on multiple layers of redundancy, faithfully followed safety protocols, pilot checklists and codes of practice that have made the unnatural business of humans ...
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.)