Decay

Decay may refer to:

Science and technology

 * Bit decay, in computing
 * Decay time (fall time), in electronics
 * Distance decay, in geography
 * Software decay, in computing

Biology

 * Decomposition of organic matter
 * Mitochondrial decay, in genetics
 * Tooth decay (dental caries), in dentistry

Physics

 * Optical decay, in quantum physics
 * Orbital decay, the process of prolonged reduction in the height of a satellite's orbit
 * Particle decay
 * Radioactive decay

Mathematics

 * Exponential decay

Psychology and sociology

 * Decay theory, in psychology and memory
 * Social decay (decadence), in sociology
 * Urban decay, 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, 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
 * "Decay" (Ride song)
 * "Decay" (Biohazard song)
 * "Decay" (Sevendust song), 2013
 * Decay Music, 1976 album by Michael Nyman
 * In Decay, 2012 album by Com Truise
 * The Years of Decay, 1989 album by Overkill (band)

Other

 * Beta decay (finance)