liaison
Americannoun
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liaisons
plural
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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.
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a person who initiates and maintains such a contact or connection.
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an illicit sexual relationship.
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Cooking. the process of thickening sauces, soups, etc., as by the addition of eggs, cream, butter, or flour.
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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
noun
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communication and contact between groups or units
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(modifier) of or relating to liaison between groups or units
a liaison officer
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a secretive or adulterous sexual relationship
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one who acts as an agent between parties; intermediary
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the relationship between military units necessary to ensure unity of purpose
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(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 ( ɔ̃ ), to give ils ont ( il zɔ̃ )
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any thickening for soups, sauces, etc, such as egg yolks or cream
Usage
What does liaison mean? A liaison is a person who acts to arrange and assist interaction between parties. A close synonym is intermediary. A more informal synonym is go-between. It can also refer to communication, interaction, or a meeting between such parties. The verb liaise comes from liaison and typically means to act as a liaison by doing such arranging, assisting, and communicating. But liaison is also used in several other, more specific contexts. In the context of the military, liaison refers to the contact or connection maintained by communications between units in order to ensure concerted action—or the person who maintains this contact. In cooking (especially classical French cooking), it can be used as a technical term for the process of thickening sauces, soups, and other dishes, such as by adding eggs, cream, butter, or flour. Liaison is also a somewhat formal term for a secretive sexual relationship, especially one in which at least one of the partners is cheating on their spouse. A much more common word for this is affair. Example: In my work as an interdepartmental liaison, I’ve learned that communication and trust are keys to success.
Other Word Forms
Noun Inflected Forms
Etymology
Origin of liaison
First recorded in 1640–50; from French, Old French, from Latin ligātiōn-, stem of ligātiō “a binding”; see ligation
Explanation
Employ the French-sounding word liaison to refer to a relationship, a link between people or groups who aids communication. There are two main definitions for liaison that stem from Old French and before that, the Latin word for "to bind." The first definition refers in general to a connection or a relationship that serves effective communication. The second definition refers more specifically to an illicit relationship, or an affair, and can have a negative connotation.
Vocabulary lists containing liaison
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Harry Potter and the Half-Blood Prince
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Invisible Man
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
He seems like a man she could marry—until he abruptly and inexplicably ends the liaison, sending her spiraling.
From The Wall Street Journal ● Nov. 5, 2026
“We hear from liaison that costs pressures are the number one consideration…There are an increasing number of firms that think inflation at 3.0% to 3.5% is the new norm,” he added.
From The Wall Street Journal ● Oct. 20, 2026
In an earlier statement, gardaí said a senior investigating officer had been deployed to the incident and family liaison officers had also been appointed.
From BBC ● Oct. 13, 2026
On Friday, Trump announced his new pick for White House press secretary, Katie Zacharia, a 42-year-old conservative commentator and public relations liaison who frequently appears on Fox.
From Salon ● Oct. 9, 2026
He was the liaison between the South American Indians and the Brazilian government.
From "Death on the River of Doubt" by Samantha Seiple
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The Los Angeles County Metropolitan Transportation Authority, or Metro, translates documents into Spanish, hosts bilingual workshops and funds community liaisons.
From Los Angeles Times ● Apr. 28, 2026
Not that the children who passed through the Innocenti’s chambers were necessarily parentless: The vast majority were illegitimate, the result of reckless or criminal liaisons their natural parents found it necessary to cover up.
From The Wall Street Journal ● Dec. 23, 2025
They also serve as liaisons to the White House and the National Security Council.
From Salon ● Aug. 27, 2025
Joe Mungo Reed’s second novel, ‘Hammer,’ is a slow burn of dangerous liaisons revolving around a Russian oligarch who comes to oppose Vladimir Putin.
From Los Angeles Times ● Jun. 3, 2025
“Certainly, my best. And I was quite right: depend on that: there are a thousand reasons why liaisons between governesses and tutors should never be tolerated a moment in any well-regulated house; firstly—”
From "Jane Eyre" by Charlotte Brontë
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Get a wordDefinitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.