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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.
"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
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
While different in nature, data redundancy also occurs in database systems that have values repeated unnecessarily in one or more records or fields, ...
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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.)