[lee-ey-zawn, lee-uh-zon, -zuhn or, often, ley-; lee-ey-zuhn, -zon; French lye-zawn]
noun, plural liaisons [lee-ey-zawnz, lee-uh-zonz, -zuhnz or, often, ley-, lee-ey-zuhnz, -zonz; French lye-zawn] .
the contact or connection maintained by communications between units of the armed forces or of any other organization in order to ensure concerted action, cooperation, etc.
a person who initiates and maintains such a contact or connection.
an illicit sexual relationship.
Cookery. the process of thickening sauces, soups, etc., as by the addition of eggs, cream, butter, or flour.
Phonetics. a speech-sound redistribution, occurring especially in French, in which an otherwise silent final consonant is articulated as the initial sound of a following syllable that begins with a vowel or with a silent h, as the z- and n- sounds in Je suis un homme [zhuh swee zœ nawm] .

1640–50; < French, Old French < Latin ligātiōn- (stem of ligātiō) a binding. See ligation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
liaison (lɪˈeɪzɒn)
1.  communication and contact between groups or units
2.  (modifier) of or relating to liaison between groups or units: a liaison officer
3.  a secretive or adulterous sexual relationship
4.  one who acts as an agent between parties; intermediary
5.  the relationship between military units necessary to ensure unity of purpose
6.  (in the phonology of several languages, esp French) the pronunciation of a normally silent consonant at the end of a word immediately before another word commencing with a vowel, in such a way that the consonant is taken over as the initial sound of the following word. Liaison is seen between French ils (il) and ont (), to give ils ont ()
7.  any thickening for soups, sauces, etc, such as egg yolks or cream
[C17: via French from Old French, from lier to bind, from Latin ligāre]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1640s, from Fr. liaison "a union, a binding together," from L.L. ligationem (nom. ligatio) "a binding," from L. ligatus, pp. of ligare "to bind" (see ligament). Originally a cookery term for a thickening agent for sauces. Sense of "intimate relations" is from 1806. Military
sense of "cooperation between branches, allies, etc." is from 1816. The noun meaning "one who is concerned with liaison of units, etc." is short for liaison officer.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The hospital's visiting-nurse liaison would help us by making arrangements for
  outpatient nursing care.
UN agencies should create liaison positions to these groups.
She is not angry with him and being intelligent she realizes that a secret
  liaison is all that is possible from his point of view.
As in all labor disputes, a liaison officer was called, but the two sides could
  not agree on a figure.
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