Other forms: liaising, liaised, liaises
To liaise is to keep in touch between two groups so they work together. Liaise with the police, liaise closely, somebody to liaise.
It is a back-formation from liaison and was resisted as an ugly novelty when it appeared, which nobody now remembers. It is the standard verb of emergency planning and of any work across organisations.
1verbliaiseTo keep in touch between two groups so they work together.
“Our office will liaise with the hotel to arrange your transport from the airport.”
liaise is a communicating.
A back-formation from liaison, from French liaison, a binding, from lier, to bind.
French
liaison — binding
English, today
liaise
a back-formation from liaison, itself from French liaison (“binding”).
Etymology from Wiktionary, CC BY-SA