Redundancy

Redundancy or redundant may refer to:

Language

 * Redundancy (linguistics), information that is expressed more than once

Engineering and computer science

 * Data redundancy, database systems which have a field that is repeated in two or more tables
 * Logic redundancy, a digital gate network containing circuitry that does not affect the static logic function
 * Redundancy (engineering), the duplication of critical components or functions of a system with the intention of increasing reliability
 * 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

Biology

 * Codon redundancy, the redundancy of the genetic code exhibited as the multiplicity of three-codon combinations
 * Cytokine redundancy, a term in immunology referring to the phenomenon in which, and the ability of, multiple cytokines to exert similar actions
 * Gene redundancy, the existence of several genes in the genome of an organism that perform the same role to some extent

As a proper name

 * "Redundant" (song), 1997 song by American rock band Green Day
 * Redundant (play), 2001 drama by Leo Butler

Other uses

 * Redundant church, no longer used for worship
 * Redundancy in United Kingdom law, dismissal for economic reasons