Interference is the act of interfering, invading, or poaching. Interference may also refer to:

Communications

Interference (communication) In telecommunications, an interference is that which modifies a signal in a disruptive manner, as it travels along a communication channel between its source and receiver. The term is often used to refer to the addition of unwanted signals t ...

, anything which alters, modifies, or disrupts a message *

Adjacent-channel interference Adjacent-channel interference (ACI) is interference caused by extraneous power from a signal in an adjacent channel. ACI may be caused by inadequate filtering (such as incomplete filtering of unwanted modulation products in FM systems), improp ...

, caused by extraneous power from a signal in an adjacent channel *

Co-channel interference Co-channel interference or CCI is crosstalk from two different radio transmitters using the same channel. Co-channel interference can be caused by many factors from weather conditions to administrative and design issues. Co-channel interferen ...

, also known as crosstalk * Electromagnetic interference, disturbance that affects an electrical circuit * Inter-carrier interference, caused by Doppler shift in OFDM modulation *

Intersymbol interference In telecommunications, intersymbol interference (ISI) is a form of distortion of a signal in which one symbol interferes with subsequent symbols. This is an unwanted phenomenon as the previous symbols have a similar effect as noise, thus making ...

, distortion caused by successive symbols

Entertainment

* Interference (band), an Irish band which formed in 1984 * ''Interference'' (Crease album), 1995 * ''Interference'' (Cubanate album), 1998 * ''Interference'' (film), Paramount's first all-talking film * "Interference" (Prison Break episode), a 2007 episode * ''

Interference – Book One ''Faction Paradox'' is a series of novels, audio stories, short story anthologies, and comics set in and around a "War in Heaven", a history-spanning conflict between godlike "Great Houses" and their mysterious enemy. The series is named after a ...

'', a 1999 ''Doctor Who'' novel by Lawrence Miles * ''

Interference – Book Two ''Faction Paradox'' is a series of novels, audio stories, short story anthologies, and comics set in and around a "War in Heaven", a history-spanning conflict between godlike "Great Houses" and their mysterious enemy. The series is named after a ...

'', a 1999 ''Doctor Who'' novel by Lawrence Miles * ''Interference'' (novel), a 2019 novel by Sue Burke

Science

Biology

Crossover interference Crossover interference is the term used to refer to the non-random placement of crossovers with respect to each other during meiosis. The term is attributed to Hermann Joseph Muller, who observed that one crossover "interferes with the coincident ...

, non-random placement of crossovers with respect to each other during meiosis *

RNA interference RNA interference (RNAi) is a biological process in which RNA molecules are involved in sequence-specific suppression of gene expression by double-stranded RNA, through translational or transcriptional repression. Historically, RNAi was known by ...

, a process within living cells that moderates the activity of their genes * Vaccine interference, interaction between two or more vaccines mixed in the same formulation *

Viral interference Viral interference, also known as superinfection resistance, is the inhibition of viral reproduction caused by previous exposure of cells to another virus. The exact mechanism for viral interference is unknown. Factors that have been implicated a ...

, one viral infection inhibiting another

Physics

Interference engine An interference engine is a type of 4-stroke internal combustion piston engine in which one or more valves in the fully open position extends into any area through which the piston may travel. By contrast, in a non-interference engine, the piston ...

Interference fit An interference fit, also known as a pressed fit or friction fit, is a form of fastening between two tightfitting mating parts that produces a joint which is held together by friction after the parts are pushed together. Depending on the amoun ...

, in engineering *

Interference lithography Interference lithography (or holographic lithography) is a technique that uses coherent light (such as light from a laser) for patterning regular arrays of fine features without the use of complex optics, optical systems or photomasks. Basic prin ...

, in optics *

Thin-film interference Thin-film interference is a natural phenomenon in which light waves reflected by the upper and lower boundaries of a thin film Interference (wave propagation), interfere with one another, increasing reflection at some wavelengths and decreasing it ...

, in optics *

Wave interference In physics, interference is a phenomenon in which two coherent waves are combined by adding their intensities or displacements with due consideration for their phase difference. The resultant wave may have greater amplitude (constructive in ...

, in physics

Other

Interference ripples Interference ripples are a type of sedimentary structure Sedimentary structures include all kinds of features in sediments and sedimentary rocks, formed at the time of deposition. Sediments and sedimentary rocks are characterized by bedding, ...

, in geology *

Interference theory The interference theory is a theory regarding human memory. Interference occurs in learning. The notion is that memories encoded in long-term memory (LTM) are forgotten and cannot be retrieved into short-term memory (STM) because either memory co ...

, in psychology

Sports

Pass interference In American and Canadian football, pass interference (PI) is a foul that occurs when a player interferes with an eligible receiver's ability to make a fair attempt to catch a forward pass. Pass interference may include tripping, pushing, pulli ...

, a penalty in American football and Canadian Football *

Interference (baseball) In baseball, interference occurs in situations in which a person illegally changes the course of play from what is expected. Interference might be committed by players on the offense, players not currently in the game, catchers, umpires, or spec ...

, changing the course of play from what is expected *

Interference (ice hockey) A penalty in ice hockey is a punishment for an infringement of the rules. Most penalties are enforced by sending the offending player to a penalty box for a set number of minutes. During the penalty the player may not participate in play. Penalties ...

Other uses

Interference (chess) In the game of chess, interference occurs when the line between an attacked piece and its defender is interrupted by sacrificially interposing a piece. It is a chess tactic which seldom arises, and is therefore often overlooked. Opportunities ...

Interference proceeding In United States patent law, an interference proceeding, also known as a priority contest, is an '' inter partes'' proceeding to determine the priority issues of multiple patent applications. Unlike in most other countries, which have long had a ...

, in U.S. patent law *

Interfering thread nut An interfering thread nut is a type of locknut A locknut, also known as a lock nut, locking nut, self-locking nut, prevailing torque nut,. stiff nut or elastic stop nut, is a Nut (hardware), nut that resists loosening under vibrations and torq ...

, a type of locknut *

Statistical interference When two probability distributions overlap, statistical interference exists. Knowledge of the distributions can be used to determine the likelihood that one parameter exceeds another, and by how much. This technique can be used for geometric di ...

, in statistics