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Decay may refer to:


Science and technology

* Bit decay, in computing * Software decay, in computing *
Distance decay Distance decay is a geographical term which describes the effect of distance on cultural or spatial interactions. The distance decay effect states that the interaction between two locales declines as the distance between them increases. Once the d ...
, in geography * Decay time (fall time), in electronics


Biology

*
Decomposition Decomposition or rot is the process by which dead organic substances are broken down into simpler organic or inorganic matter such as carbon dioxide, water, simple sugars and mineral salts. The process is a part of the nutrient cycle and ...
of organic matter *
Tooth decay Tooth decay, also known as cavities or caries, is the breakdown of teeth due to acids produced by bacteria. The cavities may be a number of different colors from yellow to black. Symptoms may include pain and difficulty with eating. Complicatio ...
(dental caries), in dentistry * Mitochondrial decay, in genetics


Physics

*
Orbital decay Orbital decay is a gradual decrease of the distance between two orbiting bodies at their closest approach (the periapsis) over many orbital periods. These orbiting bodies can be a planet and its satellite, a star and any object orbiting it, or ...
, the process of prolonged reduction in the height of a satellite's orbit *
Particle decay In particle physics, particle decay is the spontaneous process of one unstable subatomic particle transforming into multiple other particles. The particles created in this process (the ''final state'') must each be less massive than the original, ...
*
Radioactive decay Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is consid ...
* Optical decay, in quantum physics


Mathematics

*
Exponential decay A quantity is subject to exponential decay if it decreases at a rate proportional to its current value. Symbolically, this process can be expressed by the following differential equation, where is the quantity and (lambda) is a positive rate ...


Psychology and sociology

* Decay theory, in psychology and memory *
Social decay The word decadence, which at first meant simply "decline" in an abstract sense, is now most often used to refer to a perceived decay in standards, morals, dignity, religious faith, honor, discipline, or skill at governing among the members of t ...
(decadence), in sociology *
Urban decay Urban decay (also known as urban rot, urban death or urban blight) is the sociological process by which a previously functioning city, or part of a city, falls into disrepair and decrepitude. There is no single process that leads to urban deca ...
, in sociology


Entertainment

* Network decay (channel drift), in television programming *
Decay (DC Comics) Decay is the name of three fictional characters owned by DC Comics. The first was an enemy of the pre-Crisis Supergirl, while the second appeared as a villain in the ''Wonder Woman'' comic book series. The third version appeared in the New 52 as a ...
, a comic book character * '' Half-Life: Decay'', a 2001 video game add-on *
Deekay Deekay is a Danish production and songwriting team founded by Lars Halvor Jensen, Martin Michael Larsson with other members Tim "Data" McEwan, Daniel "Obi" Klein and Johannes "Josh" Jørgensen. The name Deekay comes from the acronym dk, which ...
, a Danish production team * Decay (professional wrestling), a professional wrestling stable in TNA Wrestling


Film

* ''Decay'' (2012 film), a 2012 zombie film set at the Large Hadron Collider * ''Decay'' (2015 film), a 2015 American film


Music

* how quickly the sound drops to the sustain level after the initial peak, see
ADSR envelope ADSR may refer to: * ADSR envelope (attack decay sustain release), a common type of music envelope * Accelerator-driven sub-critical reactor, a nuclear reactor using a particle accelerator to generate a fission reaction in a sub-critical assembly ...
* "Decay" (Ride song) * "Decay" (Biohazard song) * "Decay" (Sevendust song), 2013 * '' Decay Music'', 1976 music album by Michael Nyman * ''
The Years of Decay ''The Years of Decay'' is the fourth studio album by thrash metal band Overkill, released on October 13, 1989 through Atlantic and Megaforce Records.Overkill (band) Overkill is an American thrash metal band, formed in 1980 in New Jersey. They have gone through many lineup changes, leaving bassist D.D. Verni and lead vocalist Bobby "Blitz" Ellsworth as the only constant members. In addition to Verni and El ...
* '' In Decay'', 2012 album by Com Truise


Other

* Beta decay (finance)


See also

*
Weathering Weathering is the deterioration of rocks, soils and minerals as well as wood and artificial materials through contact with water, atmospheric gases, and biological organisms. Weathering occurs '' in situ'' (on site, with little or no movement ...
*
Decomposition (disambiguation) Biology and ecology Decomposition is the process through which organic matter is broken down into simpler molecules. Decomposition, decompose may also refer to: Chemistry * Chemical decomposition or analysis, in chemistry, is the fragmentation ...
* * {{disambiguation