- 1[uncountable, singular] liaison (between A and B) a relationship between two organizations or different departments in an organization, involving the exchange of information or ideas Our role is to ensure liaison between schools and parents. We work in close liaison with the police.
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- 2[countable] liaison (to/with somebody/something) a person whose job is to make sure there is a good relationship between two groups or organizations the White House liaison to organized labor
- 3[countable] liaison (with somebody) a secret sexual relationship, especially if one or both partners are married synonym affair
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