Liaison (noun)

1. A relationship or connection between people, groups, or organizations.
2. A person who acts as a link between two organizations or people.
3. A communication or cooperation that facilitates a close working relationship.

Origin:

From french, meaning 'link' or 'bond'. first recorded in english in the early 19th century.

Examples:

1. The company sent a liaison to the trade show to represent their interests.
2. The embassy appointed a new liaison to work with the local government.
3. The liaison between the two companies helped to establish a strong partnership.
4. The military liaison was responsible for coordinating the joint operation.
5. The union and management appointed a liaison to resolve their differences.