n. 25B6; noun
the branches work in close liaison : COOPERATION, contact, association, connection, collaboration, communication, alliance, partnership.
Dave was my White House liaison : INTERMEDIARY, mediator, middleman, contact, link, linkman, linkwoman, linkperson, go-between, representative, agent.
a secret liaison : (LOVE) AFFAIR, relationship, romance, attachment, fling, amour, affair of the heart, (romantic) entanglement; informal hanky-panky.