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 In electronics, fall time (pulse decay time) t_f is the time taken for the amplitude of a pulse to decrease (fall) from a specified value (usually 90% of the peak value exclusive of overshoot or undershoot) to another specified value (usually 10 ...

(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 is e ...

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, 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 * Optical decay, in quantum physics

Mathematics

* Exponential decay

Psychology and sociology

Decay theory The Decay theory is a theory that proposes that memory fades due to the mere passage of time. Information is therefore less available for later retrieval as time passes and memory, as well as memory strength, wears away. When an individual learns so ...

, in psychology and memory * Social decay (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), 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) Decay is a professional wrestling stable in Impact Wrestling, consisting of Black Taurus, Crazzy Steve, Rosemary, Havok (who also appears as her split personality, Jessicka) and Taya Valkyrie, who is an associate of the group. Rosemary, Valkyri ...

, 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 * "Decay" (Ride song) * "Decay" (Biohazard song) * "Decay" (Sevendust song), 2013 * ''

Decay Music ''Decay Music'' is the 1976 debut album by Michael Nyman, released on Brian Eno's Obscure Records music label. The two works on the album, "1-100" (composed 1 December 1975) and "Bell Set No. 1" (1974) are both built around the musical concept ...

'', 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 ''In Decay'' is a compilation album by American electronic musician Seth Haley's project Com Truise, released on July 16, 2012, by the independent record label Ghostly International. It is a collection of tracks that, prior to the release, we ...

'', 2012 album by Com Truise

Other

Beta decay (finance) In finance, the beta (β or market beta or beta coefficient) is a measure of how an individual asset moves (on average) when the overall stock market increases or decreases. Thus, beta is a useful measure of the contribution of an individual a ...