A usually secretive or illicit sexual relationship.

synonyms: affair, affaire, amour, intimacy, involvement.

Roget 961: impurity; uncleanness etc. (filth) 653; immodesty; grossness etc. adj.; indelicacy, indecency; impudicity^†; obscenity, ribaldry, Fescennine, smut, bawdry^†, double entente, equivoque [Fr.].    concupiscence, lust, carnality, flesh, salacity; pruriency, lechery, lasciviency^†, lubricity; Sadism, sapphism^†.    incontinence, intrigue, faux pas [Fr.]; amour, amourette^†; gallantry; debauchery, libertinish^†, libertinage^†, fornication; liaison; wenching, venery, dissipation.    seduction; defloration, defilement, abuse, violation, rape; incest.    prostitution, social evil, harlotry, stupration^†, whoredom, concubinage, cuckoldom^†, adultery, advoutry^†, crim.    con.   ; free love.    seraglio, harem; brothel, bagnio^†, stew, bawdyhouse^†, cat house, lupanar^†, house of ill fame, bordel^†, bordello.    ... show more

Dutch: affaire, verhouding

A channel for communication between groups:
— He provided a liaison with the guerrillas.

synonyms: contact, inter-group communication, link.