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Redundancy or redundant may refer to:

Language and arts[edit]

Computer science and engineering[edit]

  • Data redundancy, database systems which have a field that is repeated in two or more tables
  • 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
  • Redundant code, computer program code that has no effect on program output
  • Redundancy check, error detection made possible by adding redundant information to a message or signal
  • Logic redundancy, a digital gate network containing circuitry that does not affect the static logic function


  • 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

Other uses[edit]

  • Layoff, termination of employment of a person whose post becomes unnecessary
  • Voluntary redundancy, termination of employment by agreement between employee and employer
  • Redundancy in English law, redundancy in English labour law refers to the dismissal of an employee

See also[edit]