From Longman Dictionary of Contemporary Englishliaisonli‧ai‧son /liˈeɪzən $ ˈliːəzɑːn, liˈeɪ-/ ●○○ noun 1 [singular, uncountable]CONTACT somebody the regular exchange of information between groups of people, especially at work, so that each group knows what the other is doingliaison between close liaison between the army and policeliaison with better liaison with other agenciesin liaison with something The project has been set up in liaison with the art department.2 [countable] (also liaison officer) someone whose job is to talk to different departments or groups and to tell each of them about what the others are doingliaison to Renee Ball, liaison to the State Parks Authority3 [countable]SEX/HAVE SEX WITH a secret sexual relationship between a man and a woman, especially a man and a woman who are married but not to each other → affair
Examples from the Corpus
liaison• Meanwhile, Augustine formed a liaison with a woman of low birth by whom he had a son.• Associative feminist psychologies make unstable, continually changing liaisons with these social objects; and so they are associative in two senses.• Two policemen are responsible for community relations and two policewomen for juvenile liaison, one each of whom is a sergeant.• I am saying this in a letter because I am sorry to say I can not get to the next liaison meeting.• Not until 1980 was there a proposal to establish a permanent liaison committee between the two organizations.• She felt that, even by Nora's standards, Constance was too headstrong for romantic liaisons.• But Charlie also sets out on a series of scandalous liaisons and unfortunate marriages with very young girls.• But hers was an unpleasant liaison.liaison between• Turner serves as a liaison between management and staff.Origin liaison (1600-1700) French lier “to tie” 