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 See also Voluntary redundancy, termination of employment by agreement between employee and employer