Coupling is a connection or joint between two things. Coupling may also refer to: Coupling (physics), when two systems are interacting with each other Rotational–vibrational coupling, occurring when rotation frequency of an object is close to or identical to a natural internal vibration frequency Angular momentum coupling, the combining of quantized angular momentum (e.g., the interaction between two nuclei in nuclear magnetic resonance) Quantum coupling, when quantum states in one of the systems will cause an instantaneous change in all of the bound systems Coupling (computer programming), the degree to which each program module relies on each one of the other modules Coupling (electronics), the transfer of a signal from one medium or circuit block to another Coupling (genetics), a type of genetic linkage Coupling (piping), a short length of pipe or tube to connect two pipes or tubes together Coupling (probability), a proof technique in probability theory Railway coupling, a mechanism for connecting railway rolling stock Azo coupling, often called "coupling", an electrophilic substitution reaction Coupling reaction, reactions between hydrocarbon fragments in organic chemistry Hose coupling, a piece on the end of a hose to connect it to extra hoses or hose appliances Coupling track, a term in music recording for a B-side track Joint encoding, an audio compression technique in which the redundancy of information between audio channels is reduced; also commonly known as channel coupling or stereo coupling Mating or the act of sexual intercourse Coupling, the distance formed by the lumbar vertebrae of a horse's back. Television Coupling (UK TV series), a British sitcom written by Steven Moffat for the BBC Coupling (U.S. TV series), a short-lived American sitcom based on the British series Coupling (Greek TV series), a short-lived Greek sitcom based on the British series See also Decoupling (disambiguation) Coupling rod a device for connecting the driving wheels of a locomotive Couple (disambiguation) Coupler (disambiguation) Short-coupled (disambiguation) Uncouple (disambiguation)