Liaison means communication between two or more groups, or co-operation or working together. Liaison or liaisons may refer to:

General usage

Affair An affair is a sexual relationship, romantic friendship, or passionate attachment in which at least one of its participants has a formal or informal commitment to a third person who may neither agree to such relationship nor even be aware of i ...

, an unfaithful sexual relationship *

Collaboration Collaboration (from Latin ''com-'' "with" + ''laborare'' "to labor", "to work") is the process of two or more people, entities or organizations working together to complete a task or achieve a goal. Collaboration is similar to cooperation. Most ...

Co-operation Cooperation (written as co-operation in British English) is the process of groups of organisms working or acting together for common, mutual, or some underlying benefit, as opposed to working in competition for selfish benefit. Many animal a ...

Arts and entertainment

* Liaisons (''Desperate Housewives''), a 2007 episode of the American drama series ''Desperate Housewives'' * Liaisons (''Star Trek: The Next Generation''), a 1993 episode of ''Star Trek: The Next Generation'' * "Liaisons", a song from the 1973 musical '' A Little Night Music'' by Stephen Sondheim * ''

Les Liaisons dangereuses ''Les Liaisons dangereuses'' (; English: ''Dangerous Liaisons'') is a French epistolary novel by Pierre Choderlos de Laclos, first published in four volumes by Durand Neveu from March 23, 1782. It is the story of the Marquise de Merteuil and ...

'', a 1782 French novel by Pierre Choderlos de Laclos * '' Liaisons: Re-Imagining Sondheim from the Piano'', a 2015 album performed by Anthony de Mare

Businesses and organisations

Air Alliance Air Alliance was an airline based in Quebec, Canada, which was operational from its formation in 1987 until 1999, when it was absorbed into Air Nova. The brand name ''Alliance'' was then used by Air Canada until 2011 to refer to its eastern Tier I ...

, a defunct Canadian airline (call sign: ''Liaison'') *

Liaison Agency Flanders-Europe The Liaison agency Flanders-Europe ( nl, Vlaams-Europees verbindingsagentschap) or vleva was set up by the Flemish Government on 22 July 2005 to enhance the Flemish presence at the European level and to promote of Flemish interests in Europe ...

, a Flemish government body * Liaison Committee (House of Commons of the United Kingdom), of the UK Parliament's lower house * Liaison Committee (House of Lords), of the UK Parliament's upper house * Liaison Committee on Medical Education, an accreditation body for Northern American schools of medicine

Military

Liaison aircraft A liaison aircraft (also called an army cooperation aircraft) is a small, usually unarmed aircraft primarily used by military forces for artillery observation or transporting commanders and messages. The concept developed before World War II and ...

, a small aircraft used by military forces **

Liaison pilot A liaison pilot was a World War II United States enlisted pilot, whose wings bore an "L" in the center. They flew light single engine liaison aircraft. Included were many enlisted aviation students who washed out of pilot training after having sol ...

, a World War II pilot who flew liaison aircraft **

Liaison Pilot Badge The Glider Pilot, Liaison Pilot, and Service Pilot badges were qualification badges of the United States Army Air Forces issued during the years of World War II to identify a rating in one of three specialized, limited-duty pilot categories whose s ...

, a qualification badge issued by the United States Army Air Forces during World War II * Liaison officer, a military officer who coordinates different forces or national units usually at Staff level *

Military Liaison Element A military liaison element (MLE) is small group of special forces personnel, sometimes just one or two at a time, attached to embassies in Africa, Southeast Asia, South America, or elsewhere that terrorists are thought to be operating, planning att ...

, US special forces personnel attached to embassies * Military liaison missions, Cold War military intelligence missions in Germany

Science

Liaison (French) In French, liaison () is the pronunciation of a linking consonant between two words in an appropriate phonetic and syntactic context. For example, the word ''les'' ('the') is pronounced , the word ''amis'' ('friends') is pronounced , but the ...

, a phonological phenomenon in the French language * Liaison psychiatry, a medical field treating mental conditions comorbid with physiological ones

Waterways

Liaison Dunkerque-Escaut The Dunkirk-Scheldt Canal is a 189 km long series of historic canals, and the canalised river Scheldt that were substantially rebuilt from the mid-1950s up to ca. 1980, with some new sections, from Dunkirk to the Belgian border at Mortagne-d ...