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English definition of “liaison”

liaison

noun [C/U]  /liˈeɪˌzɑn, ˈli·ə-/ us  
communication between groups and the useful relationship that this creates, or a person who does the communicating between the groups: [U] There is an unfortunate lack of liaison between the departments. A liaison is also a romantic relationship.
(Definition of liaison from the Cambridge Academic Content Dictionary © Cambridge University Press)
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